Network Analysis And Synthesis(indiabix)

NETWORK ANALYSIS AND SYNTHESIS 1. In a parallel resonant circuit, the circuit current at resonance is maximum. A.

4. Henry is equivalent to A.

Volts/Ampere

B. Weber/Volt C. Weber/Ampere

True D. Weber/Ampere2

B. False Answer: Option B Explanation: In parallel resonance current is minimum.

Answer: Option C Explanation: Inductance is flux per ampere. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 5. In a minimum function 2. The rms value of wave in figure is

A.

the degree of numerator and denominator are equa

B. the degree of numerator and denominator are uneq about 95 V

C. the degree of numerator is one more than degree o

B. about 80 V

D. the degree of numerator is one less than degree of

A.

C. about 50 V D. about 25 V Answer: Option B Explanation:

Answer: Option A Explanation:

If degrees of numerator and denominator were unequal, Such a function cannot be a minimum function. Therefore denominator must be equal.

6. When a current source I is suddenly connected across a time t = 0, the voltage across the current source is shown View Answer Discuss in Forum Workspace Report

3. An RLC series circuit is underdamped. To make it overdamped, the value of R A.

has to be increased

A.

a series combination of R and C

B. has to be decreased

B. a parallel combination of R and C

C. has to be increased to infinity

C. a series combination of R and parallel combination

D. has to be reduced to zero

D. a pure capacitor

Answer: Option A Explanation:

Answer: Option C Explanation:

For overdamping R is more.

Initially capacitor behaves as short-circuit and finally as o

View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

7. The driving-point impedance Z(s) of a network has a pole-zero locations as shown in the figure. If Z(0) = 3, then Z (s) is

B. 4/3 C. 0 D. ∞ Answer: Option A Explanation:

= 4/9. View Answer Discuss in Forum Workspace Report

9. For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is

A.

A. B.

100 Ω

B. 50 Ω C. 25 Ω

C.

D. 10 Ω D. Answer: Option B Explanation:

Answer: Option D Explanation: Z0 = Zoc Zsc . View Answer Discuss in Forum Workspace Report

From figure, The impedance function

10. The terms RMS and average values apply only to sine w A. and Z(0) =

while in question Z(0) = 3

True

B. False Answer: Option B Explanation:

=3 k = 2. View Answer Discuss in Forum Workspace Report

These terms are applicable to all waveshapes. 11. The drift velocity of electrons is A.

8.

very small as compared to speed of light

B. equal to speed of light and i(t) is a unit step, then V(t) in the steady state is given by A.

4/9

C. almost equal to speed of light D. half the speed of light Answer: Option A Explanation:

14. In an R-C series circuit excited by a voltage E, the charge across capacitor + View Answer Discuss in Forum Workspace Report at t = 0 is A. 0 Drift velocity of electrons is very small.

12. Wave A = 100 sin ωt and wave B = 100 cos ωt. Then A.

rms values of the two waves are equal

B.

rms values of A is more than that of B

rms values of A is less than that C. of B rms values of the two waves may D. or may not be equal Answer: Option A Explanation: Since peak values are equal, their rms values are equal irrespective of phase difference. View Answer Discuss in Forum Workspace Report

B. CE C. CE (1 - e-t/RC) D. none of the above Answer: Option A Explanation: Voltage across a capacitor cannot change instantaneously. View Answer Discuss in Forum Workspace Report

15. Two networks are cascaded through an ideal buffer. If td1 the overall delay time is A.

td1 + td2

B. t2d1 + t2d2 C. td1 + td2 D.

13. Z(c) for the network shown in the figure is The value of C and R are, respectively

Answer: Option C Explanation: In cascaded networks delay times are added.

16. A series RC circuit has R = 5 Ω and C = 10 μF. The curre applied voltage is A.

252 sin (20000t + 45°)

B. 252 sin (20000t - 45°) C. 252 sin 20000t A.

1/6 F and 4 Ω

B. 2/9 F and 9/2 Ω

D. 252 sin (20000t - 90°) Answer: Option B Explanation:

C. 2/3 F and 1/2 Ω D. 1/2 F and 1 Ω View Answer Discuss in Forum Workspace Report Z = R2 + XC2 = 50 V = 550 sin(20000 t - 45°) V = 252 sin(20000 t - 45°) View Answer Discuss in Forum Workspace Report

C.

17. A capacitor stores 0.15C at 5 V. Its capacitance is A.

D. none of the above

0.75 F

Answer: Option C Explanation: i(t) is the incoming current. The currents leaving node 1

B. 0.75 μF C. 0.03 F D. 0.03 μF

are View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: Q = CV or 0.15 = C(5) or C = 0.03 F. View Answer Discuss in Forum Workspace Report

20. In the circuit of figure, the switch is closed at t = 0. At t = is

18. A 0.5 μF capacitor is connected across a 10 V battery. After a long time, the circuit current and voltage across capacitor will be A.

0.5 A and 0 V

B. 0 A and 10 V

A.

C. 20 A and 5 V

B. 2.5 A

D. 0.05 A and 5 V

C. 3.1 A

Answer: Option B Explanation: When the capacitor is fully charged, i = 0 and voltage across capacitor is equal to battery voltage. View Answer Discuss in Forum Workspace Report

19. For node 1 in figure, KCL equation is

A.

B.

4A

D. 0 Answer: Option A Explanation: Capacitor behaves as a short-circuit at t = 0. 21.

22. , i(t) = A.

3e-4t - e-5t

B. 3e-4t - 2e-3t C. 2e - 5e -4t

3. Bott Duffin realisation : with non ideal transformer. Select the answer using the following codes: A.

1, 2 and 3

B. 2 and 3

-2t

D. 3e-4t - e-t Answer: Option B Explanation:

C. 1 and 3 D. 1 and 2 Answer: Option D Explanation: Bott Duffins realisation does not use transformer.

i(t) = 3e-4t - 2e-3t View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

25. The synthesis of minimum function was suggested by 23. In the figure shown, A1, A2, A3 are identical Ammeters. If A1 and A3 read 5 and 13 A respectively, reading of A2 will be

A.

O'Brune

B. R. Richards C. Bott and Duffin D. none of the above Answer: Option A Explanation: The procedure is called Brune's synthesis. 26. C = (2) (energy)/V2 A.

A.

True

8 B. False

B. 13 A C. 18

Answer: Option A Explanation:

D. 12 A Answer: Option D Explanation: A2 = 132 - 25 12 A. View Answer Discuss in Forum Workspace Report

24. Which of the following pairs are correctly matched? 1. Brune's realisation : realisation with ideal transformer. 2. Cauer realisation : ladder realisation.

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27. A 3 phase balanced supply feeds 3 phase unbalanced load. Power supplied to the load can be measured by using 1. 2 wattmeter 2. one wattmeter 3. 3 wattmeter

Which of the above statements is correct? A.

C. 9 A D. can't determined

1 and 2

B. 1 and 3

Answer: Option C Explanation:

C. 2 and 3

R = 1 + (2 || R) R=2

D. 3 alone Answer: Option B Explanation:

.

A minimum of 2 wattmeters is required to measure 3 phase power. Of course power can be measured by putting one wattmeter in each phase. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

30. In the circuit of figure the voltage across capacitor when s closed at t = ∞ is

28. Which of the following is correct for a driving point functions? A.

The real parts of all poles must be negative

B.

The real parts of all poles and zeros must be negative

A.

0V

B. 20 V The real parts of all poles and C. zeros must be negative or zero D.

C. very large

The real parts of all zeros must be negative

D. 7.5 V Answer: Option D Explanation:

Answer: Option C Explanation:

Voltage across capacitor = voltage across 3Ω resistance

It is a necessary condition for response to be stable. View Answer Discuss in Forum Workspace Report

= 31.

In the series coupli

29. An infinite ladder is constructed with 1 Ω and 2 Ω resistors shown below.

A.

0

B. 0

C. 0 A.

8.18 A

B. 0 A

D. 1

Answ Expla

Mutual inductance wm = ωk L1L2 InmRC circuit current leads the = k. 2. 8j2the = 4k. j Z = 20 - j10 + j2 + j6 + 2.4kj - 2j + 8kj = 0 atvoltage. resonance -2 = -8k View in k= 1/4 Answer 0.25 Discuss . Forum Workspace Report View Answer Discuss in Forum Workspace Report

32. The degree of the nodes 1, 2, 3, 4 is

34. The impedance of an RC series circuit is 12 Ω at f= 50 Hz. At f= 200 Hz, the impedance will be A.

more than 12

B. less than 3 C. more than 3 Ω but less than 12 Ω D.

A.

more than 12 Ω but less than 24 Ω

Answer: Option C Explanation: Z = R2 + XC2. When f is made four times, XC becomes one-fourth but R remains the same. View Answer Discuss in Forum Workspace Report

2

B. 3 C. 2 for 1, 2, 3, and 3 for 4 D. all 3 Answer: Option D Explanation:

35. A current is flowing through a conductor with non-uniform A.

B. current will be the same at all the cross-sections.

Degree of node is the no.of branch incident to it.

C. current will be different but current density will be s

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D. current will be the same but current density will be Answer: Option D Explanation:

33. In an RC series circuit R = 100 Ω and XC = 10 Ω. In this circuit

Current density = current/area of cross-section. Same cu

Since, area of cross-section is non-uniform, current dens sections.

A.

the current and voltage are in phase

B.

the current leads the voltage by about 6°

C.

the current leads the voltage by about 84°

A.

D.

the current lags the voltage by about 6°

B.

Answer: Option B Explanation:

current will be different at different cross-sections.

36. A series RL circuit has current will be

C.

4 sin (4t - 45°)

. If a voltage 4 sint +

C. 4 rad/sec

D.

D. 16 rad/sec

Answer: Option B Explanation: R = 4 Ω, L = 1 H, ω = 4 rad/sec, XL = 4 Ω

Answer: Option B Explanation: When ω = 4 rad/sec ωL and equal.

are

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39. The current rating of a cable depends on A.

length of cable

View Answer Discuss in Forum Workspace Report B. diameter of cable 37. The electrical energy required to heat a bucket of water to a certain temperature is 2 kWh. If heat losses, are 25%, the energy input is A.

2.67 kWh

B. 3 kWh C. 2.5 kWh

C. both length and diameter of cable D. none of the above Answer: Option B Explanation: Current rating depends only on area of cross-section and hence diameter. View Answer Discuss in Forum Workspace Report

D. 3.5 kWh Answer: Option A Explanation: Since 25% of input is lost, 0.75 Input = 2 or input = View Answer Discuss in Forum Workspace Report

38. The circuit in figure will act as ideal current source with respect to terminals A and B when frequency is

40. In an ac circuit, the maximum and minimum values of po A.

2 and 0

B. 1 and 0 C. 0 and -1 D. 1 and -1 Answer: Option B Explanation:

Power factor is maximum and equal to 1 for purely resist and equal to zero for purely reactive load. 41. The time constant of the circuit in figure shown.

A.

0

B. 1 rad/sec

A.

RC

B. 50 Ω

B.

C. 20 Ω C.

D. 5 Ω Answer: Option A Explanation:

D.

At parallel resonance circuit impedance Answer: Option B Explanation: = . Time constant Req.C when V is shorted and R is seen from C then Req = R || R = R/2 View Answer Discuss in Forum Workspace Report . View Answer Discuss in Forum Workspace Report 44. The impedance matrices of two, twoport network are given 42. In the circuit shown in given figure, the values of i(0+) and I(∞), will be respectively

by and . If these two networks are connected in series, the impedance matrix of the resulting two-port network will be A.

A.

zero and 1.5 A

B. 1.5 A and 3 A

B.

C. 3 A and zero D. 3 A and 1.5 A Answer: Option C Explanation:

C.

D. indeterminate I(t) = 6 e-t - 3 e-0.5t at t = 0, I(0) = 3A at t = ∞, I(∞) = 0. View Answer Discuss in Forum Workspace Report

43. A two branch parallel circuit has a 20 Ω resistance and 1 H inductance in one branch and a 100 μF capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is A.

500 Ω

Answer: Option B Explanation: Impedance matrices will be added. View Answer Discuss in Forum Workspace Report

45. As compared to the number of network elements in Brun elements Bott-and Duffin in realization is A.

more

B. less C. equal

D. any of the above

B. L

Answer: Option A Explanation:

C. C

Semiconductor To avoid mutually coupled inductors, more elements D. are needed. Answer: Option C 46. A sinusoidal voltage has peak to peak value of 100 V. The rms value is Explanation: A. 50 V When a current pulse is applied to a capacitor the voltage rises linearly and B. 70.7 V becomes constant at the end of pulse. C. 35.35 V View Answer Discuss in Forum Workspace Report D. 141.41 V Answer: Option C Explanation: Peak value = 50 V, rms value =

49. In figure, the current supplied by battery immediately after switching on the circuit is = 35.35 V.

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47. A capacitor is needed for an ac circuit of 230 V, 50 Hz the peak voltage rating of the capacitor should be A.

230 V

B. 0.5 x 230 V C. 2 x 230V D. 230/2V Answer: Option C Explanation: Peak voltage rating = 2 (rms voltage rating). View Answer Discuss in Forum Workspace Report

48. The current wave shape shown in figure (1) is applied to a circuit element. The voltage across the element is shown in figure (2). The element is

A.

1A

B. 4 A C. 10 A D. 0 Answer: Option A Explanation: At t = 0, inductance behaves as open circuit. View Answer Discuss in Forum Workspace Report

50. RMS value of i(t) = 10[1 + sin (- t)] is A.

10

B. 10/2 C. l50 D. 102 Answer: Option C Explanation:

A.

R

.

1. A dielectric does not have leakage current. A.

B. ∞

True C. 0

B. False D. 8

Answer: Option B Explanation:

Answer: Option C Explanation:

All dielectrics have some leakage current. View Answer Discuss in Forum Workspace Report

2. A series RLC circuit has a resonant frequency of 1000 Hz. The maximum voltage across C is likely to occur at a frequency of about A.

1000 Hz .

B. 2000 Hz C. 1025 Hz

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D. 975 Hz Answer: Option D Explanation: Maximum voltage across capacitance occurs at a frequency slightly less than resonant frequency. View Answer Discuss in Forum Workspace Report

5. A network has two branches in parallel. One branch cont branch has impedance Z2. If it is fed from an ac voltage V Z1 depends, on A.

V, Z1, Z2

B. V, Z1 C. Z1, Z2 D. V, Z1, f

3. The resistance of a 230 V, 100 W lamp is A.

529 Ω

Answer: Option D Explanation:

B. 2300 Ω

In parallel branches, the current through any branch dep and frequency only.

C. 5290 Ω

6. In the given circuit, viewed from AB, the circuit can be re

D. 23 Ω Answer: Option A Explanation:

View Answer Discuss in Forum Workspace Report A.

5 volts source in series with 10 Ω resistor

B. 7 volts source in series with 2.4 Ω resistor

4. System function , For a signal sin 2t, the steady state response is A.

1/8

C. 15 volts source in series with 2.4 Ω resistor D. 1 volt source in series with 10 Ω resistor

Answer: Option B Explanation:

D. none of the above

Answer: Option B Explanation: For RTh, Voltage source will be short circuited RTh = 2.4 Ω, VAB = 10 - 6 I 7 V. Direction of current during discharging is View Answer Discuss in Forum Workspace Report opposite to that during charging.

7. For the network of figure KVL for first loop is

View Answer Discuss in Forum Workspace Report

9. Two coils having self inductances of 10 mH and 40 mH are mutually coupled. The maximum possible mutual inductance is A.

40 mH

B. 20 mH C. 10 mH

A.

D. 5 mH Answer: Option B Explanation: Maximum mutual inductance = L1L2 = 20 mH. View Answer Discuss in Forum Workspace Report

B.

C.

D.

10. In the circuit shown in figure the current I of sinusoidal so Answer: Option C Explanation: M term is negative because i1, is entering the dotted terminal and i2, is leaving the dotted terminal. View Answer Discuss in Forum Workspace Report A. 8. An RC series circuit is charged by a voltage E. After a long time the battery is removed and a short circuit is placed across R-C. Then A.

the polarity of voltage across R is same during discharge and during charge

the polarity of voltage across R B. during discharging is opposite to that during charging C.

the polarity of voltage across R depends on time constant RC

25 A

B. 4 A C. 20 A D. Not determinable from given data

Answer: Option C Explanation: Currents in resistance and inductance are out of phase b

11. In figure the voltage drop across the 10 Ω resistance is V. The resistance A.10 will always be 0.5 AR B. will always be less than 0.5 A C.

will always be equal to or less than 0.5 A

D. may be 0.5 A or more or less Answer: Option C Explanation: A.

is 6 Ω

B. is 8 Ω

Hence less than 0.5 A.

C. is 4 Ω

View Answer Discuss in Forum Workspace Report

D. cannot be found Answer: Option A Explanation:

14. An ideal transformer has a turn ratio of 2 : 1. Taking hv side as port 1 and lv side as port through 2, transmission parameters of Current supplied by battery = Therefore current 2Ω resistance is 11 A. Voltage across R = 48 - 10 - 11 x 2 = 16 V. transformer are View Answer Discuss in Forum Workspace Report A. 12 A two branch parallel tuned circuit has a . coil of resistance 100 Ω and inductance 0.005 H in one branch and 10 nF capacitor in the second branch. At resonance frequency is A.

B.

100 rad/sec

B. 10000 rad/sec

C.

C. 1000 rad/sec D. more than 10000 rad/sec D.

Answer: Option C Explanation:

=

= 44.67 x 104 rad/sec. View Answer Discuss in Forum Workspace Report

13. A circuit is replaced by its Thevenin's equivalent to find current through a certain branch. If VTH = 10 V and RTH = 20 Ω, the current through the branch

Answer: Option C Explanation: For the given data V1 = 2V2 and I1 = 0.5 I2 . View Answer Discuss in Forum Workspace Report

15. The voltage e0 in the figure

C. ∞ D. 1

A.

48 V

Answer: Option B Explanation: 2[u(2) - u(1 - 6)] [u(4) + u(3)] [1 + 1] 4. View Answer Discuss in Forum Workspace Report

2 [1 - 0]

B. 24 V C. 36 V D. 28 V Answer: Option D Explanation:

18. Assertion (A): In an R-L circuit having high inductance, the rise of current is very slow. Reason (R): The time constant of R-L circuit is L/R.

Both A and R are true and R is A. correct explanation of A Apply mesh analysis in both the mesh by converting 8A current source into voltage source. Both A and R are true and R is B. not the correct explanation of A 80 = 18 I1 - 6I2 + 16 1 - 12I2 - 6I2 + 6I1 = - 16 C. A is true but R is false I1 = 4.3A, I2 = 2.3A Hence e0 = 13I2 13 x 2.3 28 volts. D. A is false but R is true 16. A capacitor used for Answer: Option A factor correction is power Explanation: single phase circuit decreases A high value of time constant results in A. power factor slow rise of current. View Answer Discuss in current B. line Forum Workspace Report both line current C. and p.f. 19. The distance between the plates of a the line current D. parallel plate capacitor is d. The and increases p.f. dielectric is in two parts, each of equal Answer:constants Option D ∈1 and thickness but dielectric ∈2 respectively.Explanation: The total capacitance will be proportional to Capacitor is used to improve (increase) p.f. A. Therefore, line current is decreased for the same B. ∈1 - ∈2 active power. View Answer Discuss in Forum Workspace Report C.

17. Evaluate the value of 2 [u (t - 1) - u (1 2t)] (u ( t + 1) + u (t)) at t = 3 sec. A.

0

B. 4

D. ∈1∈2 Answer: Option A Explanation: The combination is equal to two capacitors in series.

Explanation: Energy x 1 x 10-6 x 144 = -6 72 x 10 J View Answer Discuss in Forum Workspace Report Hence,

.

View Answer Discuss in Forum Workspace Report

23. The poles with greater displacement from the real axis correspond to A.

higher frequencies of oscillation

B. stable response 20. An air cored coil has an inductance of 0.3 H. If another coil has an iron core of μr = 500, the remaining quantities being the same, the inductance of second coil will beof oscillation C.thelower frequencies A.

0.3 H

D. unbounded output

B. 0.3 x 500 H

Answer: Option A Explanation:

C.

As distance from real axis increases, the frequency of oscillation increases.

D. none of the above

View Answer Discuss in Forum Workspace Report Answer: Option D Explanation: Inductance  μr. 21. A two branch tuned circuit has a coil of resistance R In and inductance L in one 24. figure, the capacitor is branch chargedand to 1 V. capacitance C in the second branch. If R is increased, dynamic resistance At the t=0 the switch is closed so that i = et. When i = 0.37 A, the voltage across A. increases capacitor is B. decreases C. remains constant D. may increases or decreases Answer: Option B Explanation: A.

1V

Dynamic resistance =

B. 0.63 V

View Answer Discuss in Forum Workspace Report

C. 0.37 V D. 0.185 V

22. A 1 μF capacitor is connected to 12 V battery. The energy stored in the capacitor is A.

12 x 10-6 J

B. 24 x 10-6 J

Answer: Option C Explanation: During discharge of capacitor vC = vR = 0.37 x 1 = 0.37 V View Answer Discuss in Forum Workspace Report

C. 48 x 10-6 J D. 72 x 10-6 J Answer: Option D

25. In a series RLC circuit p.f is lagging when f < resonance A.

True

B. False Answer: Option B Explanation: When f < fr, XC > XL and p.f is leading. 26. The Voltage e0 in the figure,

28. A constant k band pass filter has a pass band from 100 to 400 Hz. The resonant frequency of series and shunt arms is A.

3000 Hz

B. 2500 Hz C. 2000 Hz D. 1500 Hz

A.

Answer: Option C Explanation: Resonant frequency of arms in constant k band pass filter = (fc1)(fc2). View Answer Discuss in Forum Workspace Report

2V

B. 4 V C. 4/3 V

29. The circuit in figure is switched on at t = 0. At any time t, i(t) =

D. 8 V Answer: Option B Explanation: Req = 4 || 4 + 4 6Ω I= 2A I = I1 + I2 1+1 e0 = 4 x 1 4v. View Answer Discuss in Forum Workspace Report A. 27.

3 + 3e-1

B. 6 - 3e-1 Assertion (A): is positive real. Reason (R): For a positive real function Re[H(jω)] ≥ 0 for 0 ≤ ω ≤ ∞. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

C. 3 - 3e-t D. 6 - 6e-1 Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report

D. A is false but R is true Answer: Option D Explanation:

30. Two similar coupled coils are connected in series. The to connection is 100 mH. If currents is 3 A, the energy store

A is not positive real.

A.

View Answer Discuss in Forum Workspace Report

B. 0.45 J

0.9 J

C. 0.225 J D. 1.8 J

Answer: Option C 1+j=0 tan-1(1) 45°. Explanation: View Answer Discuss in Energy = 0.5 LI2. Forum Workspace Report 31. Thevenin's impedance of an ac network is in general A.

resistance

B. R and L in series

34. In the circuit of figure the current through C at t = ∞ is

C. R and C in series D. Either R and L or R and C in series Answer: Option D Explanation: Thevenin's impedance may be inductive or capacitive. A. 4 A View Answer Discuss in Forum Workspace Report B. 2.5 A 32. If operator 'a' = 1 ∠120° then (1 - a) = A.

3

C. 3.1 A D. 0

B. 3 ∠ - 30° C. 3 ∠ + 30° D. 3 ∠60° Answer: Option B Explanation: 1 - a = 1 - 1∠120° = 1 + 0.5 - j 0.866 = 1.5 - j 0.866 = 3∠-30°. View Answer Discuss in Forum Workspace Report

Answer: Option D Explanation: At t = ∞ capacitor behaves as open circuit. View Answer Discuss in Forum Workspace Report

35. The average value of the waveform is

33. A system is at rest for t < 0. It is given by If steady state is reached at t = 0, then the value of angle A is given by A.

A.

0

2V

B. 45 °

B. 0 V

C. - 45°

C. 4 V

D. ∞

D. 3 V

Answer: Option B Explanation: = U(t) sin (2t + A) y(s).s + 2y(s) = char.eqn S+2=0 jω + 2 = 0 j2 + 2 = 0

Answer: Option B Explanation:

30 - 20 10 mWb 10 mWb = (1 - k) 30m -k k = 0.67 . View Answer Discuss in Forum Workspace Report

0.33 = 1

39. Heat in calories = I2Rt/4.186. 36. An RLC series circuit has Q = 100 and ω0 = 20 rad/sec. The bandwidth is A. True A. 0.2 rad/sec B. False B. 2 rad/sec Answer: Option A Explanation: C. 20 rad/sec D. 2000 rad/sec Answer: Option A Explanation:

Calories and joules are related by mechanical equivalent of heat which is 4.186 . View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 40. Poles and zeros of a driving point function of a network a The network consists of 37. For making a capacitor, the dielectric should have A.

high ∈r

B. low ∈r C. ∈r = 1 D. ∈r neither too high nor too low Answer: Option A Explanation: A high ∈r will lead to high value of capacitance. View Answer Discuss in Forum Workspace Report

38. In an unloaded transformer, the fluxes limiting the primary and secondary are 30 mWb and 20 mWb. The coefficient of coupling is A.

1

B. 0.1 C. 0.33 D. 0.67 Answer: Option D Explanation: Φ11 = (1 - k) Φ1 φ11 = φ1 - φ2

A.

R and C

B. L and C C. R and L D. R, L and C

Answer: Option B Explanation: In network having only L and C, poles and zeros of drivin alternate on jω axis. 41. For the circuit in figure, fed by a unit step voltage, vc =

A.

1 - e-t/RC

B. e-t/RC C. et/RC D. 1

Answer: Option A Explanation: At t = 0, vc = 0 and at t = ∞, vc = 1. This condition is satisf View Answer Discuss in Forum Workspace Report

42. For the network of figure, z11 =

44. The units for apparent power are watts. A.

True

B. False Answer: Option B Explanation: A.

5/3 Ω

B. 3/2 Ω C. 2 Ω D. 2/3 Ω Answer: Option A Explanation:

Apparent power has units of voltamperes. View Answer Discuss in Forum Workspace Report

45. In a series RLC circuit the phase angle θ of impedance Z behave as A.

resistive circuit

B. RC circuit View Answer Discuss in Forum Workspace Report

C. RL circuit D. either RL or RC circuit

43. In figure

Answer: Option B Explanation: In RL circuits phase angle of Z is positive. 46. If A = 3 + j1, A4 = A.

3.16 ∠18.4°

B. 100 ∠73.72° C. 100 ∠18.4° D. 3.16 ∠73.22° A.

Wave A is lagging wave B by ∠θ

B. Wave A is leading wave B by ∠θ Wave A is lagging wave B by ∠θ C. and the two waves have same rms values Wave A is lagging wave B by ∠θ D. and the two waves have different rms values Answer: Option B Explanation: Wave A starts its cycle θ° earlier than wave B. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: 3 + j1 = 10∠18.43° = (10)4 View Answer Discuss in Forum Workspace Report

47. In a two terminals network the O.C. voltage measured at the given terminals is 100 V and s.c., currents at the same terminals 5 A. If a load of 80 Ω resistance is connected at the terminals, load current is A.

1A

B. 1.25 A C. 6 A D. 6.25 A

Answer: Option A Explanation:

A.

0°

B. 180° C. 45° View Answer Discuss in Forum Workspace Report

48. Figure shows a dc circuit fed by a current source. With respect to terminals AB, Thevenin's voltage and Thevenin's resistance are

D. 90° Answer: Option D Explanation: When ω = ∞, XL = ωL = ∞.

1. In figure, the value of R should be

A.

VTH = 5 V, RTH = 0.75 Ω

B. VTH = 2.5 V, RTH = 0.75 Ω 12 Ω

C. VTH = 2.5 V, RTH = 1 Ω

A.

D. VTH = 5 V, RTH = 1 Ω

B. 6 Ω

Answer: Option B Explanation:

C. 3 Ω D. 1.5 Ω Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report The resistance of parallel combination = 49. Colour code of carbon resistors has only two bands. A.

True

B. False Answer: Option B Explanation: It has four bands. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

2. An RLC series circuit has R = 7.07 Ω, L = .707 H and C = 7.07 μF. At Half power frequencies the circuit impedance is likely to be A.

7.07 Ω

B. 10 Ω C. 14.14 Ω D. 20 Ω

Answer: B 50. A coil has resistance R and inductance L. At ω = ∞ the phase Option angle between voltage and Explanation: current is

At half power frequency the circuit impedance is 2 times resistance. View Answer Discuss in Forum Workspace Report

C.

D. 3. In a series R, L, C circuit the impedance triangle is the same when XL < XC and XL > XC . A.

True

Answer: Option B Explanation: The coil has R and L in series and C in parallel. View Answer Discuss in Forum Workspace Report

B. False Answer: Option B Explanation:

7. In figure, the current iL at t = ∞ is

The quadrants are different. View Answer Discuss in Forum Workspace Report

4. The zinc can of a dry cell serves as positive terminal. A.

True

B. False Answer: Option B Explanation:

A.

I

B. 0 C.

Zinc can serves as negative terminal. View Answer Discuss in Forum Workspace Report

D.

Answer: Option A Explanation: At t = ∞, inductance behaves as short5. Two similar coils have self inductance of 1 mH each. Coefficient of coupling is 0.5. The circuit. mutual inductance M is View Answer Discuss in Forum Workspace Report A. 0.25 mH B. 0.5 mH C. 0.707 mH D. 1 mH

8. When a lead acid cell is in fully charged condition the positive and negative plates are similar.

A. True Answer: Option B Explanation: B. False M = kL1L2 6. A resistance coil has self inductance L, resistance R Answer: and capacitance Option BC. The impedance across the coil is Explanation: A.

They are similar in discharged condition. View Answer Discuss in Forum Workspace Report

B.

9. Two capacitors of 1 μF and 2 μF capacitance are connected in parallel across a 30 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be A.

30 μC each

B. 60 μC each C. 30 μC and 60 μC respectively D. 60 μC and 30 μC respectively Answer: Option C Explanation: Q1 = 1 x 10-6 x 30 = 30 μC, Q2 = 2 x 106 x 30 = 60 μC. View Answer Discuss in Forum Workspace Report

12. In a series RLC circuit excited by e = Em sin ωt is seen that LC < 1/ω2. Then A.

I lags E

B. I leads E C. I leads E are in phase

D. time. voltage 10. In figure, the battery has remained switched on for a long At tacross = 0 theL and C are equal switch is closed. The current i(t) is likely to be Answer: Option B Explanation: At frequencies less than resonant frequency current leads voltage. View Answer Discuss in Forum Workspace Report

A.

6

B. 6 - 3e-1 C. 6 + 3e-1 D. 3 - 6e-1

13 A resistance R is connected to a voltage . source Vs having internal resistance Rs. A voltmeter of resistance Rm is used to measure the voltage across R. The voltmeter will read A.

Answer: Option B Explanation: B.

11.

C.

A thermistor is used for A.

D.

over voltage protection

temperature alarm Answer: Option B. D circuit Explanation: Effective resistance ofautomatic R and light C. control Rm is

D. none of the above

The reading

is A. . View Answer Discuss in Forum Workspace Report

1V

B. 2 V C. 3 V D. 5 V

14. When a lead acid battery is being charged, the specific gravity of the electrolyte A.

Answer: Option C Explanation: When R = ∞, V = 5v,

Voc = 5V circuit is open

When R = 0, I = 2.5A

Isc = 2.5 circuit short circuited

decreases

B. increases C. either increases or decreases D. remains the same Answer: Option B Explanation: Specific gravity of electrolyte is highest when battery is fully charged and is lowest when discharged.

Hence the voltage across 3 Ω is 3 volt. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 17. Which statement is true for an ac circuit? 15. Assertion (A): The response of a network to unit impulse Active can bepower obtained directlyless fromthan the is always A. network function. apparent power Reason (R): The response of a network for any input can be obtained from impulse Active power cannot be more response. B. than apparent power A. Both A and R are true and R is correct explanation of A Active power is always more than B. Both A and R are true and R is not the correct explanation C. of A reactive power C. A is true but R is false D. D. A is false but R is true Answer: Option A Explanation:

Active power cannot be more than reactive power

Answer: Option B Explanation:

and apparent power are equal Convolution integral can be used to find the responseActive for any arbitrary input in terms of for resistive circuit. Otherwise active power impulse response. is less than apparent power. 16. In the circuit shown in figure, for different values of R, the values of V and I are given. Other elements remaining the same. when R = ∞, V = 5 voltView Answer Discuss in Forum Workspace Report 1. R = 0, I = 2.5 A 2. R = 3 Ω, the value of V is given by

18. Three inductors each 30 mH are connected in delta. The value of inductance or each arm of equivalent star is A.

Explanation: EI cos θ = 0.25 or I cos θ = 0.25

10 mH From above equations cos θ = 0.707 and θ = 45°.

B. 15 mH C. 30 mH

21.

Given I the 3 Ω

D. 90 mH Answer: Option A Explanation:

View Answer Discuss in Forum Workspace Report

A.

4

B. 8 19. If the iron core of a coil is removed so that it becomes an air cored coil, its inductance A.

C. 2

D. 16

will increase

Answe Explan Is = 20, Using s

B. will decrease C. will remain the same D. may increase or decrease Answer: Option B Explanation: μr for air is 1 while μr for iron is more than 1. View Answer Discuss in Forum Workspace Report

Is = 0, c opposit 4A 4 View A Forum

20. In figure, E = 1 V (rms value). The average power is 250 mW. Then 22. A square current wave of magnitude 1 A phase angle between E and I is is applied to an element for 5 seconds. The voltage across the element rises linearly from 0 to final value linearly. The element is A.

resistance

B. inductance A.

90°

B. 60° C. 45° D. 30° Answer: Option B

C. capacitance D. R and C in series Answer: Option C Explanation:

Charge across capacitance increases linearly. Since capacitance is constant, voltage increases linearly.

A.

View Answer Discuss in Forum Workspace Report

C. 16∠7°

16∠14°

B. 16∠49°

D. 16∠3.5 23. A periodic voltage v(t) = 1 + 4 sin ωt + 2 cos ωt is applied across a 1 ohm resistance. The power dissipated is A.

1W

Answer: Option A Explanation:

26. Zinc oxide is a non-linear resistance.

B. 11 W

A.

True

C. 21 W

B. False Answer: Option A Explanation:

D. 24.5 W Answer: Option B Explanation:

It is used in lightning arresters due to its non-linear resist View Answer Discuss in Forum Workspace Report

27.For the three coupled coils shown in figure, KVL equation is View Answer Discuss in Forum Workspace Report

24. A constant k high pass  section has a characteristic impedance of 300 Ω at f = ∞ . At f = fc, the characteristic impedance will be A.

zero

B .

B. ∞ C. 300 Ω

C .

D. more than 300 Ω Answer: Option B Explanation: For constant k high pass p section c, Z0p = infinite. View Answer Discuss in Forum Workspace Report

25. If A = 4∠7°, A2 is

A .

D .

At f = f

Answer: Option C Explanation: M12 is positive while M23 and M13 are negative because of dots shown in figure.

29. The dependent current source shown in given figure.

View Answer Discuss in Forum Workspace Report

A.

delivers 80W

B. absorbs 80W 28. Figure shows a dc circuit. The Thevenin's equivalent circuit at terminals a - b is

C. deliver 40W D. absorbs 40W Answer: Option B Explanation:

P = I2.R

A.

16 x 5

80 W,

Voltage source and current source both are in opposite direction. View Answer Discuss in Forum Workspace Report

B.

30. The current flowing through the resistance R in the circui form 2 cos 4t, where R is

C.

D. not feasible Answer: Option D Explanation: A current source with series resistance is not feasible. View Answer Discuss in Forum Workspace Report

A.

(0.18 + j0.72)

B. (0.46 + j1.90) C. - (0.18 + j1.90) D. (0.23 - 0.35 j) Answer: Option D Explanation: Inductor is not given, hence ignoring the inductance. Let the loop then

. 31.

View Answer Discuss in Forum Workspace Report Energy = voltage x charge. 34. A resistance and an inductance are connected in parallel and fed from 50 Hz A. True ac mains. Each branch takes a current of 5 A. The current B. supplied False by source is A.

10 A

B. 7.07 A C. 5 A

Answer: Option A Explanation: Energy = voltage x current x time = voltage x charge.

D. zero

32. A coil is wound having a diameter d. Its inductance is 10 mH. If it is rewound on the same core with a wire having diameter 0.5 d and total weight of the wire is the same as before, the inductance will be A.

5 mH

View Answer Discuss in Answer: Option B Workspace Report Forum Explanation: The current is 5 - j5 = 52 + 52 = 7.07 A. View Answer Discuss in Forum Workspace Report

35. Assertion (A): The inductance of an iron cored solenoid Reason (R): BH curve of an iron specimen is non-linear. A.

Both A and R are true and R is correct explanation

B. 10 mH

B. Both A and R are true and R is not the correct expl

C. 160 mH

C. A is true but R is false

D. 40 mH

D. A is false but R is true

Answer: Option C Explanation: Since diameter is halved, area of crosssection is one-fourth. The number of turns becomes four times. Inductance = μ N 2. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation:

Since B-H curve is non-linear, the inductance of iron core

36. An RC driving point impedance function has zeros at s = poles are A.

s = 0 and s = -6

B. s = -1 and s = -3 33. Permeability is analogous to A.

conductivity

B. resistivity C. retentivity D. coercivity

C. s = 0 and s = -1 D. s = -3 and s = -4 Answer: Option B Explanation: In RC functions poles and zeros are interlaced. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: 37. A triangular Pulse of 10 V peak is applied to a capacitor of 0.4 F. The change of the capacitor and its

waveform is

B. a resistance of value K C. a capacitance of value K D. either (a) or(c)

A.

Answer: Option A Explanation: Admittance of a capacitance K is Ks. View Answer Discuss in Forum Workspace Report

8 rectangular

B. 8 triangular C. 4 triangular

40. If the diameter of a wire is doubled, the current carrying c A.

D. 4 rectangular Answer: Option C Explanation: q = cv 0.4 x 10 4, triangular pulse. View Answer Discuss in Forum Workspace Report

half

B. twice C. four times D. one-fourth Answer: Option C Explanation:

38. A 10 μF capacitor is charged from a 5 volt source through a resistance of 10 kΩ. The charging current offer 35 m sec. If the initial voltage on C is - 3 V is A.

0.56 mA

B. 5.6 mA C. 6 mA

Since diameter is doubled, area of cross-section become capacity is proportional to area of cross-section. 41.

Assertion (A): The function is not positive real. Reason (R): The degrees of numerator and denominato A.

Both A and R are true and R is correct explanation

B. Both A and R are true and R is not the correct expl

D. 5 μA

C. A is true but R is false

Answer: Option A Explanation:

D. A is false but R is true

Initial current immediately after charging

Answer: Option A Explanation:

=

If degrees of numerator and denominator differ by more t real. View Answer Discuss in Forum Workspace Report

i = i0e-t/RC

0.8 mA x

0.8 x 10 0.56 mA. View Answer Discuss in Forum Workspace Report -3

42. Two sinusoidal voltage sources v1 = 50 sin (100t) and v1 = 50 sin (100t + ) are connected in parallel and fed an inductance XL = 2Ω. The cuirent through XL is A.

39. If an admittance Y(s) has a term Ks, the realization would give A.

an inductance of value K

25 A

B. about 17.5 A C. zero

D. 50 A

B. 80.4 V

Answer: Option C Explanation:

C. 92.4 V

Since voltages have a phase difference of 180°, current is zero.

D. 100 V

View Answer Discuss in Forum Workspace Report

43. In figure, the current after a long time after closing of switch is

Answer: Option C Explanation: RMS value = (50 + 50 x 0.707)2 + (50 x .707)2. 46. The energy stored in a coil is 108 J. It is opened suddenl instantaneously across the blades of switch is A.

108 W

B. 1080 W C. 10800 W

A.

1A

B. 2 A C. 0

D. 108000 W Answer: Option C Explanation:

D. infinity Answer: Option B Explanation: At t = ∞ the circuit has effectively two 6Ω resistances in parallel. View Answer Discuss in Forum Workspace Report

44. A system function , the system is at rest for t < 0. For i(t) = u(t), then v(t) is given by A.

View Answer Discuss in Forum Workspace Report

47. A parallel RLC circuit with R1 = 20, is scaled giving R2 = 104, L2 = 10-4 and C2, the value of C2 is A.

0.10 nF

B. 0.3 nF

1 - e-4t C. 0.2 nF

B. e-4t D. 0.4 nF C. e4t D. 1 + e-4t

Answer: Option C Explanation:

Answer: Option B Explanation: . View Answer Discuss in Forum Workspace Report

45. Two voltages 50 V each have a phase difference of 45°. The rms value of resultant sum of the two voltages is A.

70.7 V 0.02 x 10-8

0.2 nF.

View Answer Discuss in Forum Workspace Report

shown in figure(2) the Thevenin's equivalent is

48. Thermistor has a positive temperature coefficient. A.

True A.

B. False

10 V in series with 1.2 Ω resistance

B. 6 V in series with 1.2 Ω resistance

Answer: Option B Explanation:

C. 10 V in series with 5 Ω resistance

Temperature coefficient of thermistor is negative.

D. 6 V in series with 5 Ω resistance Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report

. 49. In figure, power in 6 Ω resistor is zero then V =

A.

1. A magnetic circuit has an iron length of 20 cm A magneti and air gap length 0.1 cm. If μr = 200 then and air ga

202∠45°

A.

mmf for iron and air gap are equal

A.

mmf

B.

mmf for iron is much less than that for air gap

B.

mmf air g

C.

mmf for iron is much more than that for air gap

C.

mmf air g

D. either (a) or (c) Answer: Option A Explanation:

B. 20 ∠30°

D. eithe

Answer: O Explanati

C. 20 ∠45° D. 202∠30° Answer: Option A Explanation: Power in 6Ω resistor can be zero only if current in 6Ω resistor is zero. Therefore, voltages of nodes a and b are equal . Since equal resistances of 5Ω are on two sides of node b, View Answer Discuss in Forum Workspace Report

.

View Answ Forum Wo 2. A circuit is fed by two sources of the same frequency and values 100 ∠0° V and 20 ∠30°V. The current in a particular branch is 5 ∠19° A. If the magnitudes of the sources and changed to 200 ∠0° V and 40 ∠30° V, the current in that branch should be A.

5 ∠19° A

B. 10 ∠19° A 50. The Thevenin's equivalent of network in figure(1) is a 10 V source in C. 10 ∠38° AB A as series with 2 Ω resistance. If a 3 Ω resistance is connected across D. 10 ∠9.5° A Answer: Option B

Explanation:

A.

Since strengths of both sources are doubled, the current would become twice.

B. 0

View Answer Discuss in Forum Workspace Report

3. Two coils X and Y have self inductances of 5 mH and 10 mH and mutual inductance of 3 mH. If the current in coils X change at a steady rate of 100 A/s, the emf induced in coil Y is A.

2221.44 A/s

C. - 2221.44 A/s D. - 3141.6 A/s Answer: Option B Explanation:

i = 10 sin 314.16 t, At t = 0.00 0. 6. In the circuit shown in the figure, the current supplied by

0.3 V

B. 0.5 V C. 1 V D. 1.5 V Answer: Option A Explanation:

A.

28 A

B. 4 A View Answer Discuss in Forum Workspace Report

4. Two capacitors of 2 μF and 4 μF capacitance are connected in series across a 30 V dc battery. After the capacitors have been charged, the voltage across them will be A.

15 V each

B. 10 V and 20 V C. 20 V and 10 V D. 30 V each Answer: Option C Explanation: Charge will be the same. Since Q = C V voltage will be inversely proportional to Q. Hence 20 V and 10 V. View Answer Discuss in Forum Workspace Report

C. 20 A D. not determinable from the data given Answer: Option C Explanation: I = (12)2 + (16)2 = 20 A. View Answer Discuss in Forum Workspace Report

7. The frame of an electric motor is earthed through three earthing plates resistances 30 Ω, 20 Ω and 10 Ω respectively. During fault the energy dissipated by three plates are W 1, W2 and W3. Then A.

W1 > W 2 > W 3

B. W1 < W 2 < W 3 C. W1 = W 2 = W 3 D. W1 + W 3 < W 2 Answer: Option B Explanation:

Energy dissipated by the plate with lowest resistance is maximum. 5. A 50 Hz current has an amplitude of 10 A. The rate of change of current at t = 0.005 after i = View Answer Discuss in 0 and is increasing is Forum Workspace Report

Explanation: 8. If figure, power dissipated in 30Ω resistance will be maximum when value of R =

L = B - N + 1 = 12 - 8 + 1 = 5. View Answer Discuss in Forum Workspace Report

10. Two voltages are 50 ∠0 V and 75 ∠ - 60° V. The sum of A.

109 ∠ - 60° V

B. 109 ∠ - 25° V 30 Ω

C. 109 ∠ - 36.6° V

B. 16 Ω

D. 100 ∠ - 50.1° V

A.

Answer: Option C Explanation: 50Ð0 = 50 + j 0.75∠-60° = 37.5 - j 64.95 Sum = (50 + 37.5) - j 64.95 = 87.5 - j 64.95 = 109∠-36.6° 11. An RLC series circuit is fed form 100 V ac supply. Induct resonance, the voltage across inductance is

C. 9 Ω D. zero Answer: Option C Explanation:

A. When R = 0, circuit current =

and

power dissipated = watts, which is the maximum possible value. View Answer Discuss in Forum Workspace Report

750 V

B. 100 V C. about 13.5 V D. 1500 V Answer: Option A Explanation:

Voltage across inductance at resonance = QV = 7.5 X 10 9. In the following non-planar graph no.of independent loop equations are

View Answer Discuss in Forum Workspace Report

12. For an RLC series circuit, Z(s) will be of the form of A.

B.

C. A.

8

B. 12 C. 7 D. 5 Answer: Option D

D. Answer: Option D Explanation:

D. any of the above w hich is similar to View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: It t is temperature coefficient at t°C and 0 is temperature coefficient at 0°C. . View Answer Discuss in Forum Workspace Report

13. In the circuit shown in the figure, steadystate was reached when the switch S was open. The switch was closed at t = 0. The initial value of the current through the capacitor 2 C is

15. A wire has a resistance R ohm. If another wire of the sam double the diameter (as compared to the first wire), the r A.

0.5 R

B. 0.25 R C. 0.125 R D. R/16 Answer: Option D Explanation:

Since diameter is double, area of cross-section is four tim A.

zero

B. 1 A

.

C. 2 A

16. Volt is equivalent to A.

D. 3 A

joule/coulomb

Answer: Option C Explanation:

B. joule/watt

At steady state capacitor will be open and inductor will short circuited.

C. joule/ampere

V across 2C will be =

12v

D. joule/volt Answer: Option A Explanation:

. View Answer Discuss in Forum Workspace Report

14. As temperature increases, the temperature coefficient of a metal A.

decreases

View Answer Discuss in Forum Workspace Report

17. A two branch parallel tuned circuit has a capacitance C in one of the two branches and resistance R in second branchs. As C is decreased the dynamic resistance

B. increases

A.

C. remains unchanged

B. decreases

increases

C. remains constant

Good lamp will short the circuit.

D. may increases or decreases

View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation:

20. Find RL for maximum power transfer Dynamic resistance = as C is decreased.

and increases

View Answer Discuss in Forum Workspace Report

18. A system function the resonant frequency in rad/sec and bandwidth in rad/sec is given by A.

A.

3Ω

B. 1.125 Ω

5, 10

C. 4.17 Ω

B. 5, 4

D. none

C. 10, 4

Answer: Option A Explanation: Using y - Δ transformation

D. 10, 10 Answer: Option C Explanation: ωn = 10, ωr 10 B=a 4. View Answer Discuss in Forum Workspace Report

19. The reading of the voltmeter in figure will be __________ volt.

A.

100

B. 150 C. zero D. 200 Answer: Option C Explanation:

Req = (9 || 8) 11 (9 || 18) 21.

3Ω.

View Answer Discuss in Forum Workspace Report doubled, becomes one-fourth but R2 remains the same. 24. The final value View Answer Discuss in Forum Workspace Report of A.

22. An RL series circuit has an impedance of 20 Ω when frequency is 25 Hz. At f= 50 Hz, the impedance will be A.

is ∞

B. 2 C. 1

40 Ω

D. zero

B. 20 Ω

Answer: Option C Explanation:

less than 40 W but more than 20 C. Ω

Use final value theorem. less than 20 W but more than 10 D. Ω Answer: Option C Explanation: Z = R2 + XL2. When frequency is doubled, XL becomes twice but R remains the same. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

25. The resistance of the circuit shown is figure is

23. In figure, the voltmeter is ideal. The transformer has two identical windings with perfect coupling. The reading of voltmeter is A.

5Ω

B. More than 6 Ω C. More than 4 Ω D. Between 6 and 7 Ω A.

Answer: Option A Explanation:

440 V

The parallel combination of 3, 5 and 4 ohm is short-circui resistance is zero.

B. 220 V C. 110 V D. zero Answer: Option D Explanation: The secondary voltage is equal to primary voltage and the two voltages oppose each other.

26.

29. For H(s) to be positive C. 9 Hreal, the condition Re[H(jω)] ≥ 0 for 0 ≤ ω ≤ ∞ is D. condition 4.5 H A. a necessary Answer: Option D B. a sufficient condition Explanation: M = 0.5(27 x 3) a necessary and sufficient conditionView Answer Discuss in Forum Workspace Report D. is not a necessary condition C.

27. In a lead acid cell, the positive plate has spongy lead. A.

True

B. False

Answer: Option A Explanation: H(s) must possess two more properties if it is positive real. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: The positive plate has lead peroxide.

30. In the circuit, shown the current I marked is given by

View Answer Discuss in Forum Workspace Report

28. The rms voltage measured across each of the circuit element in figure is as shown, when the circuit is excited by a sinusoidal voltage Es, the rms value of the source voltage es is

A.

2.22 A

B. 1.78 A C. 4.44 A D. 2 A Answer: Option A Explanation:

When 9 V source is connected, 2V source is short circuit A.

10 volt

B. 2 volt C. Es D. 5 volt Answer: Option D Explanation: Voltage across C = -10jv Voltage across L = + 14 jv source voltage Es = VR + jVL - jVC = 3 + j. 14 - j. 10 3 + j4 rms of Es = VR2(VL - VC)2 = 32 + 42 5 volt. View Answer Discuss in Forum Workspace Report

I' = 9/4.5 = 2 A, I1 = 1.5 A when 2 volt source is connected, then Req = 4.5

I2 = 0.22 A I = I1 + I2 = 0.66 A. 31. For a network having 1 Ω resistor and 1 F capacitor in se A. B. C. 1 + s

and Z4 is equal to D. Answer: Option A Explanation:

View Answer Discuss in Forum Workspace Report

32. In given figure the switch was closed for a long time before opening at t = 0. The voltage Vx at t = 0+ is

A. B. C. D. Answer: Option B Explanation:

A.

= 375 ∠ - 40 - 30.

25 V

B. 50 V

View Answer Discuss in Forum Workspace Report

C. -50 V D. 0 V Answer: Option C Explanation: at t = 0, L will act as short circuit hence I = 2.5 A. Vx = 2.5 x 20 50v, but in opposite to current source. Hence Vx = 50v. View Answer Discuss in Forum Workspace Report

34. S is open for a long time and steady state is reached S is closed at t = 0. Let iL the current in the inductor At t = 0+,

is given by

33 The ac bridge shown in the figure is . balanced if A.

-2

B. -1 C. -4 D. -∞ Answer: Option B Explanation:

If S is open, for long time then C will be short circuited,

voltage across 2Ω resistor = 2 volt (V0)

C. less than 0.6 T D. 0.6 T or less than 0.6 T Answer: Option D Explanation: Since μr for silicon steel is more than that of cast iron, flux density will be more than 0.6 T. View Answer Discuss in Forum Workspace Report

38. The circuit shown in figure, will act as an ideal current source with respect to terminals A and B, when frequency is View Answer Discuss in Forum Workspace Report

35. In an air cored coil, a current of 0.7 A causes a flux of 5 x 10-6 Wb. If the core is made of cast iron and the coil is similar, the same current can set up a flux of about A.

5 x 10-6 Wb A.

zero

B. 5 x 10-8 Wb B. 1 rad/s C. 10-2 Wb C. 4 rad/s D. 5 x 10-4 Wb Answer: Option D Explanation: The permeability of cast iron is about 100.

D. 16 rad/s Answer: Option C Explanation:

36. When cells having different emfs are connected in parallel, a circulating current flows. A.

True

B. False Answer: Option A Explanation:

to find the frequency. Put XC + XL = 0. View Answer Discuss in Forum Workspace Report

To avoid circulating current cells in parallel should 39.be identical. View Answer Discuss in Forum Workspace Report The realization of a term in the impedance function will give 37. In a specimen of cast iron, a field strength of 400 AT/m cause a flux density of 0.6 T. In a specimen of silicon steel, the same value of H would cause B to be A.

0.6 T

B. more than 0.6 T

A.

an inductance of value K0 in series

B.

an inductance of value 1/K0 in series

C.

even to odd or odd to even polynomials

D. even to even polynomials

Answer: Option D Explanation:

D. 45 Ω Answer: Option B Explanation:

Impedance of capacitance View Answer Discuss in Forum Workspace Report

40. An RL admittance function can also be realized as A.

RC admittance function

View Answer Discuss in Forum Workspace Report

43. The circuit in figure(1) is replaced by that in figure(2). It remains same R0 will be

B. RC impedance function C. LC admittance function D. LC impedance function Answer: Option B Explanation: RL admittance function and RC impedance function have similar forms. A. 41. In active filters inductances are divided because they A.

are always associated with same resistance

B.

are bulky and unsuitable for miniaturization

C. are non linear D. saturate quickly Answer: Option B Explanation: Active filters consist of electronic components and have very small size. View Answer Discuss in Forum Workspace Report

zero

B. R C. 2R D. 4R Answer: Option D Explanation: Net resistance of circuit is 4.571 R and that of circuit is 0.571 R. Hence R0 be 4R. View Answer Discuss in Forum Workspace Report

44. In a varistor the v-i graph is linear. A.

True

B. False 42. Three resistance of 15 Ω each are connected in delta. The resistance of equivalent star will have a value of A.

15 Ω

B. 5 Ω C. 5/3 Ω

Answer: Option B Explanation: The v-i graph, in varistor, is non-linear. View Answer Discuss in Forum Workspace Report

45. In the circuit of figure the current through 5 Ω resistance Answer: at t = Option 0+ is A Explanation: Because of inertia the current cannot change instantaneously. Therefore it behaves as O.C. at t = 0. View Answer Discuss in Forum Workspace Report A.

4A

B. 2.5 A

48. A bulb rated at 60 W, 120 V is used for 30 minutes. The charge associated with this operation is

C. 3.1 A

A.

D. 0 A

B. 900 C

Answer: Option A Explanation:

3600 C

C. 7200 C

Since 3 ohm resistance is short-circuited by capacitor,D. I = 20/5 A. 600 C Answer: Option B A parallel plate capacitor Explanation: with air as dielectric has a capacitance C. If the dielectric has a dielectric constant ∈r and the remaining View Answer Discuss in dimensions are the same, Forum Workspace Reportthe capacitance will be

46.

A. C/∈r 49. Two coil have their axis perpendicular to ∈rC each other. TheB. coefficient of coupling k is C. ∈2rC A. 1 D. ∈3rC B. 0.5 Answer: Option B Explanation: C. more than 0 but less than 1 Capacitance ∝ ∈r. View Answer Discuss in D. 0 Forum Workspace Report Answer: Option D Explanation: 47. Assertion (A): When excited by a unit step voltage, an inductor behaves as open circuit at t = 0. Reason (R): Inductance has the property of inertia. A. B.

Both A and R are true and R is correct explanation of A Both A and R are true and R is not the correct explanation of A

When axis are perpendicular then there is no mutual coupling. View Answer Discuss in Forum Workspace Report

50. In a series RLC circuit, p-f is leading if XC < XL. A.

True

B. False C. A is true but R is false D. A is false but R is true

Answer: Option B Explanation: If XC < XL power factor is lagging.

1. In an RL series circuit the inductance is 1H and current at an instant 0.6than A. The energy cannot be is less source A. stored in magnetic field is voltage A.

0.36 J

B. 0.18 J C. 0.09 J

B.

cannot be higher than source voltage

C.

is always less than source voltage

D. 0.03 J D. is always equal to source voltage Answer: Option B Explanation: Answer: Option B Energy = 0.5 LI2 = 0.5 x 1 x 0.62 = 0.18 J. Explanation: View Answer Discuss in Forum Workspace Report A practical voltage source has some source resistance. 2. In a series ac circuit a voltage of 20 V at 25 Hz causes a current of 0.20 A, while the same voltage at 75 Hz causes a current of 0.12 A. The circuit consists of A.

R and C in parallel

B. R and C in series

Because of voltage drop across source resistance, terminal voltage cannot be higher than source voltage. If current is zero, terminal voltage and source voltage are equal. View Answer Discuss in Forum Workspace Report

C. R and L in series D. either (a) or (b) Answer: Option B Explanation: As f increases impedance increases and current decreases in RL circuit. View Answer Discuss in Forum Workspace Report

3. Elements R, L, C are connected in parallel and excited by a dc current I. If iR, iL and iC are the currents through R, L, C respectively then at t = 0 A.

iR > iL > iC

B. iL > iR > iC

5. When slider of the potentiometer AB is in the position sho reading would be indicated by an ohmmeter connected b

A.

zero

B. infinite C. can't say D. none of the above

C. iC = 0

Answer: Option A Explanation:

D. iC = I

A to C will act as short circuit, hence R = 0 if it open then

Answer: Option D Explanation: Capacitor behaves as a short-circuit at t = 0. View Answer Discuss in Forum Workspace Report

6. A series R-L circuit has R = 1 Ω and L = 1 H. It is excited state condition is reached at A.

t=1s

B. t = 0.1 s C. t = 0 s

4. In a practical voltage source, the terminal voltage

D. t = ∞ Answer: Option D

Explanation: Let the last voltage is V1 = V, V2 = Voltage i = 10 (1 - e-t). It reaches steadily state value at t = ∞ across both 1 Ω resistor View Answer Discuss in Forum Workspace Report

7. The current source in figure, can be replaced by

V + V = 2V Current in shunt resistor = i A.

a voltage source of 20 V in series with 5 ohm resistance

B.

a voltage source of 16 V in series with 4 ohm resistance

C.

a voltage source of 20 V in series with 4 Ω resistance

D.

a voltage source of 16 V in series with 5 Ω resistance

Answer: Option B Explanation:

ia = ib + ic 2v + v 3v V3 = i b x R + i a x R 3v + 2v = 5v V4 = 5v + 8v = 13v. View Answer Discuss in Forum Workspace Report

9. In figure, iL at t = 0+ is

The parallel combination of 20 Ω and 5 Ω is 4 Ω. Therefore, strength of current source is 4 x 4 = 16 A and source resistance is 4 ohms. View Answer Discuss in Forum Workspace Report

8. If the voltage across the last resistor is V, and all the resistor is unity. Then Vs is given by

A.

0

B. I C. infinite D.

A.

8V

B. 4 V

Answer: Option A Explanation: Inductance behaves as O.C. at t = 0+. View Answer Discuss in Forum Workspace Report

C. 13 V 10. In a purely inductive circuit, the current __________ the D. 0 Answer: Option A Explanation:

A.

lags, 0°

B. leads, 90°

than 50% current and dissipates more than 50% energy.

C. lags, 90°

View Answer Discuss in Forum Workspace Report

D. lags, 45° Answer: Option D Explanation:

13. In the circuit of figure, the power In inductive circuit current lags the voltage by 90°. consumed in resistance R is measured when one source is acting at one time. 11. In the circuit of figure the voltage across C at t = 0+ isThese values are 18 W, 50 W and 98 W. When all source act together the maximum and minimum power can be

A.

0V

B. 20 V C. very large

A.

D. 7.5 V

B. 166 W and 18 W

Answer: Option A Explanation:

98 W and 18 W

C. 450 W and 2 W

D. 166 W and 2 W Voltage across a capacitor cannot change instantaneously. Answer: Option B View Answer Discuss in Forum Workspace Report Explanation: Let R = 1 Ω. 12. The frame of electric motor is connected to three plates having earthing resistance of 10 Ω, 20 Ω and 30 Ω respectively. The materials of the three plates are copper, aluminium and iron respectively. The percentage of energy dissipated by 10 Ω earthing plate A.

Then I1 = 32 A, I2 = 52 A and I3 = 72 A. (I1 + I2 + I3)2 R = (152)2 R = 450 Ω. View Answer Discuss in Forum Workspace Report

14. The resistance RAB in the circuit is

is more than 50% of total energy

B. is less than 50% of total energy C.

depends on the materials of the three plates

D.

may be more or less than 50% of total energy

Answer: Option A Explanation: The parallel combination of 30 Ω and 20 Ω is 12 Ω. Since 12 Ω and 10 Ω are in parallel, the 10 ohm plate draws more

A.

10 Ω

B. 12 Ω C. 9 Ω

Explanation: At t = ∞ inductance behaves as short-circuit.

D. 3 Ω Answer: Option C Explanation:

16.

17. Current having waveform in figure flows through 10 Ω resistance. Average power is

A.

1000 W

B. 500 W (6 + 6/5) || (18 + 18/5) = 5.4 5.4 + 3.6

9 Ω.

View Answer Discuss in Forum Workspace Report

C. 333.3 W D. 250 W Answer: Option C Explanation:

15. In the circuit of figure the current through L at t = ∞ is RMS current = A, P = I2R = 333.3 W. View Answer Discuss in Forum Workspace Report

A.

0A

B. 10 A C. 6.67 A D. 5.1 A Answer: Option B

= 5.773

18. S is closed for a long time and steady state is reached. S is opened at t(0-). The voltage marked V is V0 at t = 0+ and Vf at t = ∞. Then value of V0 and Vf are

respectively

B. 4∠8° C. 4∠128° D. 4∠32° Answer: Option D Explanation:

A.

8, 8

View Answer Discuss in Forum Workspace Report 21. The switch in figure is initially closed. At t = 0 the switch i through inductance is

B. 0, 1 C. 4, 0 D. 4, 8 Answer: Option D Explanation: For Thevenin Equivalent Resistance, v = 0, I = 0

A. B. I . View Answer Discuss in Forum Workspace Report

19. Two voltages are v1= 100 sin (ωt + 15°) and v2 = 60 cosωt, then A.

D. Answer: Option C Explanation: At t = ∞ inductance behaves as open circuit. View Answer Discuss in Forum Workspace Report

v1 is leading v2 by 15°

B. v1 is leading v2 by 75° C. v2 is leading v1 by 75° D. v2 is lagging v1 by 15° Answer: Option C Explanation: v1 = 100 sin (ωt + 15°) and v2 = 60 cos ωt = 60 sin (ωt + 90°). Hence, v2 is leading v1 by (90 - 15) = 75°. View Answer Discuss in Forum Workspace Report

20. If A = 16 ∠64°, (A)0.5 is A.

C. 0

4∠64°

22. A constant k low pass T section filter has a characteristic impedance of 600  at zero frequency. At f = fc the characteristic impedance is A.

600 Ω

B. zero C. infinite D. more than 600 ohms Answer: Option B Explanation: Z0T = R0(1 - f2 / fc2)0.5. At f = f0. Z0T = 0. View Answer Discuss in Forum Workspace Report

23. The resonant frequency of the circuit shown in figure is View Answer Discuss in Forum Workspace Report

25. Bus bars are always meant for very heavy currents.

A.

A. B. 4 Hz

True

B. False

C. 2  Hz

Answer: Option B Explanation:

D. at all frequency

Bus bars are used for heavy as well as light currents.

Answer: Option A Explanation:

26. A low-pass filter frequency responce H (jω) = A (ω) ejΦ(ω distortion, if

Leq = L1 + L2 + 2m = 1 + 2 + 2 x

=4

. View Answer Discuss in Forum Workspace Report

24. For the circuit shown in the figure, the time constant RC = 1 ms. The input voltage is V1(t) = 2 sin 103 t. The output voltage V0(t) is equal to

A.

A(ω) = Cω2, Φ (ω) = kω3

B. A(ω) = Cω2, Φ (ω) = kω C. A(ω) = Cω2, Φ (ω) = kω2 D. A(ω) = C, Φ (ω) = kω-1 Answer: Option B Explanation: For distortion less transmission line View Answer Discuss in Forum Workspace Report

27. In a tungsten filament lamp

A.

sin (103 t - 45°)

B. sin (103 t + 45°) C. sin (103 t - 53°) D. sin (103 t + 53°)

A.

the current at the instant of switching is less than operating current

the current at the instant of B. switching is more than operating current

Answer: Option A Explanation:

the current at the instant of C. switching is equal to operating current

V0(t) = i(t) . jωc

the current at the instant of D. switching may be less than or equal to operating current Answer: Option D Explanation: Resistance at the time of switching on is minimum and increases due to increase of temperature.

View Answer Discuss in Forum Workspace Report

28. An RLC series circuit has R = 8 Ω, XL = 8 Ω and XC = 8 Ω Its impedance is A.

D. Answer: Option B Explanation:

8 + j 16 Ω

B. 8 + j 8 Ω C. 8 Ω D. 24 Ω Answer: Option C Explanation: Z = 8 + j(8 - 8). View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 31. The function of a choke in a fluorescent lamp is A.

at the time of starting only

B. during the working of time but not at starting time C. both at the time of starting and during working D. none of the above Answer: Option C Explanation:

29. Two similar mutually coupled coils have a total inductance of 900 mH and coefficient of coupling 0.5. The self inductance of each coils is A.

C. 75 mH D. 50 mH Answer: Option A Explanation: M = kL1L2, L1 = L2 = L, M = kL. Total inductance = L1 + L2 + 2M = 2L + 2kL = 900 mH or L(2 + 2 x 0.5) = 900 or L = 300 mH. View Answer Discuss in Forum Workspace Report

30. Flux linkages ψ and voltages v are related as

B.

C.

View Answer Discuss in Forum Workspace Report

300 mH

B. 150 mH

A.

At the time of starting the choke provides a high voltage. drop across choke so that lamp gets proper voltage.

32. A series resonant circuit is fed by a voltage having rms value V. At resonance, the voltage across inductance VL and voltage across capacitance VC are related as A.

V L > VC

B. VL < VC C. VL = VC D. VL = 0.5 VC Answer: Option C Explanation: At resonance XL = XC. Therefore IXL = IXC or VL = VC. View Answer Discuss in Forum Workspace Report

33 Calculate i(t) for t ≥ 0, assuming the . switch has been in position A for a long time at t = 0, the switch is moved to

position B. RC = 10-3,

= 0.1 e-

. Therefore at t = 0+ equals -100 A/s. View Answer Discuss in Forum Workspace Report 1000t

A.

1 + e-5 x 103t 35.

B. e-5 x 103t C. 1.11 e

In a series RLC circuit, R = 2 kΩ, L = 1H and -5 x 103t

D. 1.11 (1 - e-5 x 103t) Answer: Option C Explanation: When switch is in A position, C will be open, t < 0, i(0 ) = -

= 1.11 mA,

A.

2 x 104 Hz

B. 1/ x 104 Hz C. 104 Hz D. 2 x 104 Hz Answer: Option B Explanation:

VC(0-) = 3 k x 3.33 volt at t > 0 i(0+) = 1.11 mA, i(t) = A + B e-at

. View Answer Discuss in Forum Workspace Report 36. The function Z(s) has a pole at infinity if

where

A.

the degree of numerator and denominator of Z(s) a

B. the numerator of Z(s) is one degree higher than de

C. the denominator of Z(s) is one degree higher than n 5 x 103 at t = 0, A + B = 1.11 t = ∞, A = 0 i(t) = 1.11 e-5 x 103(t) . View Answer Discuss in Forum Workspace Report

34. In figure, capacitor is uncharged. The switch is closed at t = 0 at t = 0+ di/dt is

D. the degree of numerator and denominator are eithe Answer: Option B Explanation: If numerator is one degree higher than denominator z(s) infinity. View Answer Discuss in Forum Workspace Report

37.An input voltage V(t) = 10 2 cos (t + 10°) + 10 3 cos (2t + 10°)V is applied to a series combination of resistance R = 1 kΩ inductance L = 1H. The resulting steady-state current i(t) in ampere is A.

100 A/s

A.

10 cos (t + 55°) + 10 cos (2t + 10° tan-12)

B.

10 cos (t + 55°) + 103/2 cos (2t + 55°)

C.

10 cos (t - 35) + 10 cos (2t + 10° tan-12)

B. -100 A/s C. 1000 A/s D. -1000 A/s Answer: Option B Explanation:

D.

10 cos (t - 35) + 103/2 cos (2t + 35°)

40. An inductance having XL = 5 Ω and a capacitance having across 100 V, 50 Hz supply. The current drawn from sou A.

Answer: Option C Explanation: The steady state current i(t) = i1(t) + i2(t)

zero

B. 20 A C. 40 A D. 28.28 A

Hence ω1, ω2 = 2. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation:

The total current is 38. A thermal power plant has an efficiency of 0.4. If 0.6 kg of coal is burnt to generate 1 kWh, the calorific value of coal is A.

View Answer Discuss in Forum Workspace Report 41. In figure the total inductance of the circuit is

about 3500 kcal/kg

B. about 2500 kcal/kg

A.

C. about 1500 kcal/kg

B. L1 + L2 + M

D. about 7500 kcal/kg

C. L1 + L2 + 2M

Answer: Option A Explanation:

L1 + L2

D. L1 + L2 + M

Ther efore, calorific value

Answer: Option C Explanation: Inductances are in series aiding connection. M terms will inductance between L1 and L2 and that between L2 and L View Answer Discuss in Forum Workspace Report

= View Answer Discuss in Forum Workspace Report

42. In the network of figure, the voltage drops across R1, R2, R3 are 6 V, 8 V and 12 V with polarities as shown. The value of R3 is

39. An RC series circuit has R = 20 Ω and XC = 20 Ω. Then Z = A.

40 Ω

B. 28.28 Ω C. 20 Ω D. 1 Ω Answer: Option B Explanation: Z = 202 + 202 = 28.28 ohm. View Answer Discuss in Forum Workspace Report

A.

12 Ω

B. 8 Ω C. 5 Ω

D. 3 Ω

A.

Answer: Option D Explanation: From the given data the current through R1 is 4 A. View Answer Discuss in Forum Workspace Report

B. less than 0.6 Ω C. between 2 and 100 Ω D. more than 100 Ω

Answer: Option D Explanation: Since new diameter is 0.3 d, the new area of cross-sectio

43. Assertion (A): Millman's theorem helps in replacing a number of current sources in parallel by a single current source. Reason (R): Maximum power transfer theorem is applicable only for dc, circuits. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

less than 2 Ω

The volume remains the same. Therefore length increase

Hence View Answer Discuss in Forum Workspace Report 46.

D. A is false but R is true Answer: Option C Explanation: Maximum power transfer theorem is applicable to ac circuits. View Answer Discuss in Forum Workspace Report

44. Double integration of unit step function leads to A.

an impulse

B. a parabola C. a ramp

47. In figure which is correct at any time t

D. a doublet Answer: Option B Explanation: Integral of unit step function is ramp and integral of ramp is doublet. View Answer Discuss in Forum Workspace Report A.

I = iR + iL

= iR + iL iC is 2 Ω. It is 45. A conductor has a cylindrical shape with a diameter d.B.Its Iresistance recast into a cylindrical conductor of diameter 0.3d. The resistance of new C. I = iR + iL - iC conductor is likely to be

.

D. I = iR - iL - iC Answer: Option B Explanation:

0.75 = I2 x 1 x 1000 or I = 27.386 mA. View Answer Discuss in Forum Workspace Report 1. The three sides of an admittance triangle denote A.

G, B, Y

As per KCL sum of currents entering a node is equal to sum of currents leaving the node.

B. R, X, Y

View Answer Discuss in Forum Workspace Report

D. (R, Y, Z) or (R, X, Z)

C. G, B, Z

Answer: Option D Explanation: 48. Two coupled coils with self inductances of 4 mH and 16 mH are connected in series. The maximum possible value of inductance can be A.

Admittance triangle depicts admittance Y and its compon View Answer Discuss in Forum Workspace Report

36 mH

B. 20 mH C. 28 mH

2. A step voltage E is applied to an R-L series circuit. At t = 0, the current in the circuit is A.

E/R

D. 64 mH Answer: Option A Explanation: Inductance = 4 + 16 + 24 x 16 = 36 mH. View Answer Discuss in Forum Workspace Report

49. In using KCL it is necessary that current leaving a node is written as negative. A.

True

B. E/L C. infinity D. zero Answer: Option D Explanation: Inductance does not allow the current to increase instantaneously. View Answer Discuss in Forum Workspace Report

B. False Answer: Option B Explanation: It may be written as positive or negative as per convenience. View Answer Discuss in Forum Workspace Report

3. To find current in a resistance connected in a network, Thevenin's theorem is used VTH = 20 V and RTH = 5 Ω. The current through the resistance A.

is 4 A

B. is 4 A or less 50. A resistor is rated at 0.75 watt, 1 kΩ. Its current rating C. is is less than 4 A A.

1 mA

B. 27.386 mA C. 1.268 mA D. 5.393 mA Answer: Option B Explanation:

D.

may be 4 A or less or more than 4A

Answer: Option C Explanation:

View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: Two energy storing elements give s2 terms. View Answer Discuss in Forum Workspace Report

4. In figure, the magnitude of V 7. Two currents have the same peak value. Wave 1 is sinusoidal and wave 2 is rectangular. The ratio of their heating effects are A.

1:1

B. 1 : 2 A.

must be more than that of Va

B. must be more than that of Vb C. must be more than that of Va or Vb D.

can be equal to or less than or more than that of Va or Vb

Answer: Option D Explanation: V depends on magnitudes and phase angles of Va and Vb. View Answer Discuss in Forum Workspace Report

C. 1 : 2 D. 1 : 1.5 Answer: Option C Explanation: If peak value is Im, heating effect of sine wave and heating effect of rectangular wave ∝ Im2. View Answer Discuss in Forum Workspace Report

8. The following differential equation 5. A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum has at t = A. degree = 2, order = 1 A. zero B. infinity

B. degree = 3, order = 2

C. L/R

C. degree = 4, order = 3

D. R/L

D. degree = 2, order = 3

Answer: Option A Explanation:

Answer: Option B Explanation: degree is highest power of

6. The driving point impedance of a network is storing elements in the network is A.

1

B. 2 C. 3 D. 4

.

View Answer Discuss in Forum Workspace Report The number of energy 9. If the transmission parameters of the given networks are A = C = 1, B = 2 and D

= 3, then the value of Zm is

A. B. C. D.

A.

Ans Exp At t circu View Foru

12/13 Ω

B. 13/12 Ω C. 3 Ω D. 4 Ω Answer: Option A Explanation:

.

12. The ABCD parameters of ideal n : 1 transformer shown in the figure

are

. The value of X will be

View Answer Discuss in Forum Workspace Report

10. In figure, the current through 10 V battery is A.

n

B. 1/n C. n2 D. 1/n2 A.

0

B. 0.5 A charging

Answer: Option B Explanation:

C. 0.5 A discharging D. none of the above Answer: Option A Explanation: .

Since there is no return path, the current is zero. 11.

View Answer Discuss in Forum Workspace Report View Answer Discuss in Forum Workspace The switch in figureReport is initially closed. At t = 0 the switch is opened. At t = 0+, the current through R is 13. If A.

, the network has 1 H inductor and 1 F capacitor in parallel

B.

1 H inductor and 1 F capacitor in series

C.

1 H inductor and 1 Ω resistor in series

1 H inductor and 1 Ω resistor in D. parallel Answer: Option A Explanation:

View Answer Discuss in Forum Workspace Report 16.

The transfer function of an R-L-C circuit gi Quality factor (Q-factor) of this circuit is A.

25

B. 100 C. 50 D. 5000

which means 1 H inductance and 1 F capacitor in parallel.

Answer: Option C Explanation:

View Answer Discuss in Forum Workspace Report

14. The power dissipated in 4 Ω resistance in figure is

. A.

64 W

View Answer Discuss in Forum Workspace Report

B. 32 W C. 16 W D. 8 W Answer: Option C Explanation:

17. An RC circuit initially at rest has a step signal. The response V(t) across C is V(t) = 1 - e-at, If now there is an initial voltage on C of 2 volts for the same step signal, V(t) is now

Current through 4Ω resistance = 2 A.

A.

1 + e -at

View Answer Discuss in Forum Workspace Report

B. 1 + 2e -at C. 2 - e -at

D. 3 - e -at 15. The total inductance of two coils is 60 mH in series aiding connection and 40 mH in series Answer: opposing connection. The mutual inductance between coils is Option A Explanation: A. 20 mH At t = 0+, V0 = 4 volt. B. 10 mH C. 5 mH D. 2.5 mH Answer: Option C Explanation: at t = ∞ C open Vf = 4 x 2 = 8 volt. View Answer Discuss in Forum Workspace Report

V1 = AV2 - BI2 I/P impedance I1 = CV2 - DI2 Given V2 = - I2.R1

18. In the network of the figure is the maximum power is delivered to RL if its value is

. View Answer Discuss in Forum Workspace Report

A.

20. A series circuit having R = 3 Ω and L = 2 H is excited by a 0+, di/dt is

16 Ω

B. 40/3 Ω

A.

C. 60 Ω

5 A/s

B.

D. 20 Ω C. 20 A/s

Answer: Option B Explanation: max power will be transfer, when RL is equal to internal resistance of voltage source then View Answer Discuss in Forum Workspace Report

D. 15 A/s Answer: Option A Explanation:

. View Answer Discuss in Forum Workspace Report 21.

19. A two-port network is represented by ABCD parameters given by

If port is terminated by RL, then input impedance seen at port 1 is given by A.

B.

C.

D. Answer: Option D Explanation: From transmission matrix

22. In figure, the switch is closed at t = 0. At t = 0+ The value of current supplied by

battery is

24. Which of the following polynomials is not Hurwitz? A.

P1 = s8 + 2s6 + 4s4

B. P2 = s6 - 3s4 + 2s2 + 1 C. P3 = s4 + 3s3 + 3s2 + 2s + 1 D. A.

1A

B. 2 A C. zero D. infinity Answer: Option A Explanation: At t = 0, current in R-L branch is zero. View Answer Discuss in Forum Workspace Report

23. In the circuit shown in the figure the power dissipated in 30 Ω resistor will be maximum if the value of R is

P4 = s7 + 2s6 2s4 + 4s3 + 8s2 + 8s + 4

Answer: Option B Explanation: One coefficient is negative. Hence not Hurwitz. View Answer Discuss in Forum Workspace Report

25. In an RLC underdamped circuit A. B. C. D. Answer: Option B Explanation:

A.

30 Ω

B. 10 Ω

View Answer Discuss in Forum Workspace Report 26. A network has 10 nodes and 17 branches. The number o

C. 9 Ω

A.

D. zero

B. 9

Answer: Option D Explanation: If R = 0, it will be act a short circuit, 16 Ω Resistor will not play any role, only power dissipated in 30 Ω resistor. But it R = 0, then power dissipated in 16 Ω resistor also.

7

C. 10 D. 45 Answer: Option B Explanation:

One node is reference node. Therefore the system has 9 View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 27. In a series RC circuit Z = (R2 + ω2C2)0.5.

A.

View Answer Discuss in Forum Workspace Report

True

B. False Answer: Option B Explanation:

30. In an ac network the sum of currents entering a node is 1 leaving the node is A.

19.32 ∠45°

B. 15 ∠45° View Answer Discuss in Forum Workspace Report

C. 20 ∠45° D. zero

28. The time constant of the network shown in figure is

Answer: Option A Explanation:

As per KCL sum of currents entering a node is equal to s

View Answer Discuss in Forum Workspace Report 31. A parallel RLC network has R = 4Ω, L = 4H, C = 0.25F. T A.

1

B. 10 A.

RC

C. 20

B. 3 RC

D. 40 Answer: Option A Explanation:

C. D.

For parallel resonant circuit

Answer: Option C Explanation: Time constant t = C Req

View Answer Discuss in Forum Workspace Report

. View Answer Discuss in Forum Workspace Report

32. A T network is inserted between source and R as shown in figure. The resistance seen by the source remains the same with or without T network when R is

29. If V = 20 + j20, then loge(A) A is A.

3.342 + j 45

B. 28.28 ∠45° C. 400 ∠45°

A.

D. 3.342 + j 0.785

B. 10 Ω

Answer: Option D Explanation: 20 x j 20 = 28.28 Ð45° loge V = loge (28.28) +

5Ω

= 3.342 j.785.

C. 15 Ω D. 20 Ω Answer: Option D

Explanation:

34. In figure, the time constant for the capacitor charging is

If R = 15 Ω resistance, seen by the source =

.

View Answer Discuss in Forum Workspace Report A. 33. The circuit shown in the figure has initial current iL(0) = 1A through the inductor and an initial voltage vc(0) = 1 V across the capacitor. For input v(t) = U(t) the Laplace transform of the current i(t) for t ≥ 0 is

6 μs

B. 10 μs C. 15 μs D. 25 μs Answer: Option A Explanation:

Effective resistence is Hence RC = 6 μs.

.

View Answer Discuss in Forum Workspace Report

A.

B.

35. In figure, the short circuit current through terminal AB wil

C.

D. Answer: Option B Explanation:

A.

Apply KVL

B. 1.5 A

3A

C. 2 A D. 1 A Answer: Option A Explanation:

Vi(s) = I(s).R + Ls I(s) - Li(0+) +

No current will flow through 2Ω resistance in parallel with

Put the given values

View Answer Discuss in Forum Workspace Report

and View Answer Discuss in Forum Workspace Report

.

36. The current wave of figure, is passed through a 338. H inductor If Z(s) has during a pole theatperiod origin,0the to 2 seconds realization leads to A.

a resistance in series

B. an inductance in series C. a capacitance in series D.

a resistance or capacitance in series

Answer: Option C Explanation: A.

is 3 V

B. is 6 V

In such a function the denominator is one degree higher than the numerator.

C. increases from 0 at t = 0 to 6 V at t = 2 seconds Therefore we get a term . Hence, D. increases from 0 at t = 0 to 6 V at t = 2 secondsthe and then decreases network has capacitance in series. Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report

39. A series resonant circuit has inductance View Answer Discuss in Forum Workspace Report L. If L is increased, the resonant frequency A. 37. The minimum number of equations required to analyze the circuit shown in the figure is

increases

B. decreases C. remains constant D. may increases or decreases Answer: Option B Explanation:

A.

3

. As L increases ωr decreases. View Answer Discuss in Forum Workspace Report

B. 4 C. 6 D. 7 Answer: Option B Explanation: No. of loop = No. of equations = b - n + 1 7-4+1 4. View Answer Discuss in Forum Workspace Report

40. In a coupled coil the primary has 100 turns and secondar produces, a flux Φ = e-t. The coefficient of coupling is 1. T is A.

200 e-t V

B. 200 et V C. 200 V D. none of the above Answer: Option A Explanation:

View Answer Discuss in Forum Workspace Report B 41. The average value of periodic function v(t) in figure is.

C .

A. D .

B.

Answer: Option A Explanation:

C.

L in series gives C in parallel of the same value and vice versa.

D.

View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation:

43. With Is disconnected I = - 1, when Is = b is connected, the value of I will become . View Answer Discuss in Forum Workspace Report

42. The dual of network in figure is

A.

2A

B. -1 A C. 1 A D. 3 A A .

Answer: Option C Explanation: I = -1 when Vs connected, when Is is open let find current in 2Ω resistor when V is shorted and I is connected. then

I = -1 + 2

1 A.

C. 7.07 Ω

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D. 50 Ω Answer: Option D Explanation:

44. In a resistor the current is i and the voltage is v. The rate of dissipation of heat at any time t is A.

= 10 Ω = 10 + y(50 - XC). Hence XC = 50 Ω View Answer Discuss in Forum Workspace Report

vi

B. vit C. vt D. vit2

48. For a given voltage four heating coils will give maximum heat when connected

Answer: Option A Explanation: Rate of heat = rate of energy = power = vi. View Answer Discuss in Forum Workspace Report

A.

in parallel

B. in series C. with two parallel pairs in series D.

with one pair in parallel and the other two in series

Answer: Option A 45. When two port networks are connected in cascade, itExplanation: is more convenient to use hybrid parameters. When in parallel each will get full voltage A. True and hence maximum heat. B. False Answer: Option B Explanation:

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It is more convenient to use transmission parameters. 49. View Answer Discuss in Forum Workspace Report A system defined by is 46. If absolute potential of A is - 8 V and that of B is - 16 initially V, VAB is to x = u(t) sin 2t then atequal rest, and the forced response is K sin (2t - θ). The A. 24 V value of θ given by B. 8 V A. -tan-1(1) C. - 8 V

B. -tan-1(2)

D. - 24 V Answer: Option B Explanation: VAB = VA - VB or VAB = -8 - (-16) = 8 V. View Answer Discuss in Forum Workspace Report

C. D. 0 Answer: Option B Explanation:

47. An RLC series circuit is excited by 200 V, 100 Hz supply. The current is 20 A. If R = 10 Ω, XL = 50 Ω, XC is A.

10 Ω

B. 14.14 Ω

View Answer Discuss in Forum Workspace Report

. View Answer Discuss in Forum Workspace Report

3. In figure, the switch is closed at t = 0. After some time i = 6A and rate of change of current was 4A/s. The value 50. A two branch tuned circuit has a coil of resistance R of and inductance inductor is L in one branch and capacitance C in the second branch. If R is increased, the dynamic resistance A.

decreases

B. increases C. remains constant A.

D. may increases or decreases

1H

B. 1.5 H

Answer: Option B Explanation:

C. indeterminate D. 0.5 H and increases as L is increased. View Answer Discuss in Forum Workspace Report Answer: Option D 1. An R-L series circuit has R = 5 Ω and L = .01 H. It is Explanation: fed by ac 50 Hz supply. The rms current in the circuit is 5 A. The active power supplied by the source is Steady state current = A. A. 25 W Dynamic resistance =

Therefore, i =

B. 50 W

(1 - e-3t/L) = 6A

C. 125 W D. 250 W Answer: Option C Explanation: P = I2R = 52(5) = 125 W. View Answer Discuss in Forum Workspace Report

2. A particular current is made up of two components 10A dc and sinusoidal current of peak value 14.14A. The average of resultant current is A.

zero

B. 24.14A C. 10A D. 14.14A Answer: Option C Explanation: The average of sinusoid over 1 cycle is zero.

and these equations L = 0.5H. View Answer Discuss in Forum Workspace Report

From

4. Assertion (A): In series R-L-C circuit, the current may lead or lag the voltage depending on the value of R. Reason (R): Phase angle of an R-L series circuit is tan-1 (ωL/R). A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false D. A is false but R is true Answer: Option D Explanation: The current may lead or lag the voltage depending on values of L and C.

View Answer Discuss in Forum Workspace Report

B. critically damped C. under damped

any of the above depending the 5. In figure the switch has been in position 1 for a long time. D. At t = 0, the switch is moved to magnitude of voltage position 2. The equation for transient current is Answer: Option B Explanation:

. Since R = Rcr, critically damped response. View Answer Discuss in Forum Workspace Report

8. Class C solid insulators should not be used above 100°C.

A.

A. B.

True

B. False

C.

Answer: Option B Explanation:

D.

For class C insulators temperature limit is 180°C.

Answer: Option C Explanation:

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9. Assertion (A): Superposition theorem can be used to find the output of a full View Answer Discuss in Forum Workspace Report wave rectifier excited by sinusoidal 6. An RL impedance function can also be realized as signal sources of different frequencies connected in series. A. RC impedance function Reason (R): Superposition theorem is valid for all linear systems. B. RC admittance function When switch is in position 2, time constant is

C. LC impedance function D. LC admittance function Answer: Option B Explanation:

A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false RL impedance function and RC admittance have similar forms. D. A is false but R is true View Answer Discuss in Forum Workspace Report Answer: Option D Explanation: 7. A step voltages is applied to RLC series circuit having R = 2 Ω, L = 1 H and C = 1 F. The transient current response will be A.

over damped

Sinusoidal sources of different frequencies cannot be used for a rectifier circuit. View Answer Discuss in Forum Workspace Report

There is no role of d.c. voltage source. 3 t for will current 10. The current through a 1 mH inductance is i(t) = 2.56 Due x 10-2to- this 4 x 10 2 ≤ zero. t ≤ 20 μ sec. The voltage across the inductor is View Answer Discuss in A. 4 Forum Workspace Report B. 8 C. 0 D. 8 x 103

13. The equivalent circuit of a resistor is shown in the given figure. The resistor will be non-inductive if

Answer: Option A Explanation:

1 x 10-3 (2.56 x 10-2 - 4 x 103t) = 1 x 10-3 x 4 x 103 4 volt. View Answer Discuss in Forum Workspace Report A. 11. Insulation resistance of a cable is directly proportional to its length. A.

True

B. False Answer: Option B Explanation:

B. C. L = CR2

D. C = LR Insulation resistance is inversely proportional to length. Answer: Option B View Answer Discuss in Forum Workspace Report Explanation: 2

12. In the following circuit, i(t) under steady state is

Rationalize the function and find the value of R.

A.

B. C. 0

View Answer Discuss in Forum Workspace Report

14. For a series RLC circuit bandwidth is ω2 - ω1 = R/2L. A.

True

B. False D. Answer: Option B Explanation:

Answer: Option B Explanation:

C. ω C0V0 (cos ωt - cos2 ωt) .

D. none of the above

View Answer Discuss in Forum Workspace Report

15. If A.

, the network has 1 H inductor and 1 F capacitor in parallel

Answer: Option C Explanation: i= or i = C0 (1 - cos ωt) ωV0 cos ωt = C0ωV0 (cos ωt - cos2 ωt) View Answer Discuss in Forum Workspace Report

B. 1 H inductor and 1 F capacitor in series C. 1 H inductor and 1 Ω resistor in series

18. Figure shows an RC circuit. The magnitude plot V2/V1

D. 1 H inductor and 1 Ω resistor in parallel Answer: Option B Explanation:

which means 1 H inductance and 1 F capacitor in series. View Answer Discuss in Forum Workspace Report 16. In figure, the voltage V1 = 4∠0 V. The source voltage V2 is will rise exponentially to R2/(R1 + A. R2) as ω → ∞ B.

will rise linearly to R2/(R1 + R2) as ω→∞

C. will decrease to zero as ω → ∞ A.

8 - j8 volts

B. 4 - j4 volts C. 8 - j4 volts

D.

will rise 1 at ω = 0 and then decrease as ω → ∞

Answer: Option A Explanation:

D. 8 - j16 volts Answer: Option C View Answer Discuss in Explanation: Forum Workspace Report IR = 2∠OA, I1 = 2∠-90° = -j 2A. Total current = 2 - j2. V2 = 2 (2 - j2) + 4∠0 = 8 - j4 volts. View Answer Discuss in Forum Workspace Report 19. Assertion (A): In a circuit having high inductance, reactive power may be more than apparent power. Reason (R): Reactive power = VI sin θ. 17. A capacitor whose capacitance Ct = C0 (1- cos ωt) is fed by a sinusoidal Both A and R are true and R is A. voltage v = V0 sin ωt. The equation for correct explanation of A current i is Both A and R are true and R is A. ω C0V0 cos ωt B. not the correct explanation of A B. ω C0V0 sin ωt C. A is true but R is false

D. A is false but R is true

22. Threshold of perception occurs at a current of about 1 mA.

Answer: Option D Explanation:

A.

True

B. False

Reactive power cannot be more than apparent power.

Answer: Option A Explanation:

View Answer Discuss in Forum Workspace Report

Threshold of perception means current which causes small sensation in body.

View Answer Discuss in 20. A two branch parallel circuit has a 10 Ω resistance and 0.5 H inductance in one branch and a Forum Workspace Report 100 μF capacitor in the second branch. It is fed from 100 V ac supply. At resonance, the source current is A.

10 A

B. 1 A

23. The current wave shown in figure is applied by a 0.1 F capacitor at t = 0. At t = 0+, the voltage across capacitor is

C. 0.2 A D. 0.05 A Answer: Option C Explanation: At parallel resonance source current = View Answer Discuss in Forum Workspace Report 21. In figure, A is ideal ammeter having zero resistance. It will read __________ ampere. A. 0 B. 4 V C. 10 V D. 20 V Answer: Option A Explanation: Voltage across a capacitor cannot change instantaneously. A.

2

View Answer Discuss in Forum Workspace Report

B. 2.5 C. 3 D. 4

2 The average value of delayed full wave 4. rectified sine wave (figure) is

Answer: Option C Explanation:

View Answer Discuss in Forum Workspace Report

27. R, L and C are in parallel. The circuit is switched on to a constant current source I at t = 0. At t = ∞ the current through inductance is I.

A. B.

A.

True

B. False

C.

Answer: Option A Explanation: At t = ∞ inductance behaves as shortcircuit. View Answer Discuss in Forum Workspace Report

D. Answer: Option C Explanation:

28. A 2 mH inductor with some initial current can be represented as shown below, where s is the Laplace transform variable. The value of initial current is . View Answer Discuss in Forum Workspace Report

25. A current increasing at the rate of 1 A/s is passed through 1 F capacitor. At t = 0, i = 0. The charge stored after 1 second is A.

0.5 C

B. 1 C C. 2 C D. 4 C Answer: Option C Explanation:

A.

0.5 A

B. 1.0 A C. 2.0 A D. 0.0 A Answer: Option A Explanation:

Initial current iL(0+) or q = i dt View Answer Discuss in Forum Workspace Report 26. An RLC series circuit has R = 30 Ω, XL = 30 Ω and XC = 30 W. Its impedance is A.

30 ∠0°.

B. 30 ∠45° C. 42.42 ∠45° D. 90 ∠45°. . Answer: Option A Explanation: View Answer Discuss in Z = 30 + j (30 - 30) = 30∠0 Ω. View Answer Discuss in Forum Workspace Report Forum Workspace Report

29. As temperature increases, the temperature coefficient of metals increases. A.

True

Explanation: In a non-linear resistance v-i graph is a curve. View Answer Discuss in Forum Workspace Report

B. False Answer: Option B Explanation:

33. The Z parameters Z11 and Z21 for the 2port network in the figure.

As temperature increases the temperature coefficient of metal decreases. View Answer Discuss in Forum Workspace Report

30. In a 3 phase system, the zero sequence component of line to line voltages is zero A.

if line to line voltages are balanced

B. if line to line voltages are unbalanced

A.

Z11 = - 6/11Ω; Z21 = 16/11Ω

B. Z11 = 6/11Ω; Z21 = 4/11Ω

C. if line to line voltages are balanced or unbalanced C. Z11 = 6/11Ω; Z21 = - 16/11Ω D. if degree of unbalanced in line to line voltages isD.small Z11 = 4/11Ω; Z21 = 4/11Ω Answer: Option C Explanation:

Answer: Option C Explanation:

Zero sequence component of line to line voltage is always zero irrespective of degree Apply mesh analysis in both loop of unbalance. 11E1 = 6I1 + 4I2, E2 + 10 E1 = 4 (I1 + I2) View Answer Discuss in Forum Workspace Report 31. Magnetic effect of current is used in generators but not in motors. A.

True

B. False Z21 . View Answer Discuss in Forum Workspace Report Magnetic effect of current is used in both generators and motors. Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report 34. For the wave shown in figure, the average value is 32. For a nonlinear resistance A.

v-i plot is not a straight line

B.

resistance increases as current increases

C.

resistance decreases as current increases

D.

current decreases as voltage increases

Answer: Option A

A.

7.07 A

B. 5 A

C. 2.5 A

37. The Thevenin Resistance of the circuit is

D. 0.5 A Answer: Option B Explanation: Since area of triangle is half of the rectangle enclosing it, average value = 0.5 x peak value. View Answer Discuss in Forum Workspace Report

A.

94/7 kΩ

B. 54/7 kΩ

C. 7/54 kΩ 35. Assertion (A): For a physically realisable driving point function, the degree of numerator D. 0 and denominator should be equal. Reason (R): The sum of positive real functions is real. Answer: Option B A.

Explanation: Both A and R are true and R is correct explanation of A

Diode is a non B. Both A and R are true and R is not the correct explanation of Alinear circuit it will be removed C. A is true but R is false D. A is false but R is true Answer: Option D Explanation: The degrees can differ by a maximum of 1. View Answer Discuss in Forum Workspace Report 36. In the figure circuit, V1 = 40 V. When R is 10 Ω. When R is zero, the value of V2 will be Nodal analysis

A.

40 V

B. 30 V C. 20 V D. 10 V Answer: Option A Explanation: When R = 0, it will be short circuited and 10 Ω and 20VTH Ω= will come in series, and potential 20volt. across V1 will become 40 V by divider rule. View Answer Discuss in View Answer Discuss in Forum Workspace Report Forum Workspace Report

38. In the circuit shown in the given figure, RL will absorb maximum power when its

value is

B. E/C C. zero D. infinity Answer: Option A Explanation: Since the capacitor does not have any charge initially,

A.

2.75 Ω

View Answer Discuss in Forum Workspace Report

B. 7.5 Ω C. 25 Ω

40. The current through a 10 Ω resistance in a dc circuit havi resistance is changed to 20 Ω, the new value of current w

D. 27 Ω

A.

less than 3 A

Answer: Option C Explanation:

B. equal or less than 3 A

Circuit can be rearranged as follows

C. equal to or less or more than 3 A D. 1.5 A Answer: Option A Explanation:

The current will be less than 3 A. It may not be 1.5 A bec also affect the value of current.

View Answer Discuss in Forum Workspace Report 41. A planar graph has 6 nodes and 7 branches. The numbe A.

2

B. 3 C. 4 D. 6 Answer: Option A Explanation: In dual, node pairs and meshes are interchanged b = (n View Answer Discuss in Forum Workspace Report

Now find and find RL = ?. View Answer Discuss in Forum Workspace Report

4 An ac voltage 20 sin 1000t feeds an R-C 2 series circuit. R = 8 Ω and active power is . 4 W. The power factor is A.

39. In an RC series circuit excited by dc voltage E, the current at t = 0 is A.

1

B. 0.8 C. 0.6

E/R D. 0.4

Answer: Option D Explanation:

B. may have positive or negative real part C. must occur in conjugate pair D. must have either negative or zero real part

or or

Answer: Option D Explanation:

Only then it is possible to synthesize by R, L and C elem View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 46. In a linear circuit, the superposition principle can be appl A.

voltage and power

B. voltage and current 43. For a sine wave the average value is calculated over half the cycle. A.

True

B. False Answer: Option A Explanation:

C. current and power D. voltage, current and power Answer: Option B Explanation: Apply KVL

The average value over full cycle is zero.

(4 - I) 10 + 4 (9 - I) = 5 I

View Answer Discuss in Forum Workspace Report

P = I2.R 80 W. View Answer Discuss in Forum Workspace Report

44. Two resistances of 2 Ω each are connected in series. A shunt having zero resistance is connected across the combination. The overall resistance will be

I = 4A

47. If A = 7 ∠15, A2 is A.

49 ∠225°

B. 49 ∠30°

4Ω

C. 49 ∠15°

B. 1 Ω

D. 49 ∠7.5°

A.

C. 0.5 Ω

Answer: Option B Explanation:

D. zero Answer: Option D Explanation:

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View Answer Discuss in Forum Workspace Report

48. The colour coding of a resistors shows 100 K, ± 10%. When the resistance was measured with an ohmmeter, it read A.

95 K

45. The poles and zeros of a positive real function A.

may lie any where in s plane

B. 80 K C. 120 K

D. 85 K

A.

Va would always lag Vb

Answer: Option A Explanation:

B. Va would always lead Vb

Ohmmeter measured 100 K ± 10/2 95 Ω.

C. Va and Vb can be in phase

View Answer Discuss in Forum Workspace Report

49. The output voltage of a charger is A.

less than battery voltage

D. phase angle between Va and Vb would always be 9 Answer: Option B Explanation:

Voltage across inductance leads the current and voltage current. View Answer Discuss in Forum Workspace Report

B. same as battery voltage C. more than battery voltage D.

same or more than battery voltage

Answer: Option C Explanation: The charger has to supply current to battery for charging. This is possible only if voltage of charger is more than that of battery.

2. As per BIS, solid insulators are classified into 6 categories. A.

True

B. False Answer: Option B Explanation: The number of categories is seven. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 3. Dielectric constant of air is about 5. A. True 50. The circuit in figure has reached steady values with switch open. If switch is closed at t = 0 the voltage across 2 μF capacitance at t = 0+ is B. False Answer: Option B Explanation: ∈r for air is 1. View Answer Discuss in Forum Workspace Report A.

zero

B. 4 V C. 6 V D. 10 V

4. Consider the following units 1. sec-1 2. rad2/sec2 3. sec 4. Ω

Answer: Option A Explanation: The units of , RC and At t = 0-, VC = 0 and voltage across a capacitor cannot change instantaneously. respectively View Answer Discuss in Forum Workspace Report A. 1, 2, 4, 3 1. In the circuit of figure B. 3, 2, 1, 4

are

C. 2, 4, 1, 3

C. 6 V

D. 1, 2, 3, 4

D. - 6 V

Answer: Option D Explanation:

Answer: Option B Explanation:

has units of seconds. Therefore, 1

.

has units of sec-

has units of rad/sec.

View Answer Discuss in Forum Workspace Report

7. In figure, the charge on 0.8 μF capacitor is

Therefore has units of rad2/sec2, RC is a time constant and has units of sec. has units of ohms. View Answer Discuss in Forum Workspace Report A. 100 μC 5. In a conductor, voltage v, conductance G and charges q are related as B. 50 μC A. C. 40 μC D. 20 μC

B. C. v = Gq D. q = vG Answer: Option A Explanation:

Answer: Option C Explanation: Each of parallel combination of capacitors is equal to 1 μF. Therefore, voltage across each capacitor is 50 V. Q = 0.8 x 50 = 40 μC. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 6. The current wave in figure is passed through 3 H8.inductor. The power voltagetransfer across theorem inductance Maximum finds during the period 2 < t < 3 seconds is application in A.

power circuits

B. distribution circuits C. communication circuits D.

A.

12 V

B. - 12 V

both power and communication circuits

Answer: Option C Explanation: In power and distribution circuits efficiency has to be very high.

View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

9. In a series L-C circuit fed by ac voltage, voltage drops across L and C are 40 V and 30 V respectively. The supply voltage is A.

12. In figure, the switch is closed at t = 0. At t = 0+, di/dt = 4 A/s. Then V =

70 V

B. 10 V C. 50 V

A.

D. 1.333 V

B. 20 V

Answer: Option C Explanation: |V| = IXL - IXC. View Answer Discuss in Forum Workspace Report

10 V

C. 40 V D. 80 V Answer: Option D Explanation:

10. In a reactance function A.

all poles are simple

B. all poles and zeros are simple

View Answer Discuss in Forum Workspace Report

C. all poles and zeros are simple and lie on jω axis only 13. In figure V is ideal voltmeter having infinite resistance. It will read D. all poles and zeros lie on negative real axis __________ volt. Answer: Option C Explanation: Only then the network has only L and C. If poles and zeros are not on jω axis, resistance will be there. View Answer Discuss in Forum Workspace Report 11. In figure, the switch is closed at t = 0 when current through inductor is 6 A, the rate of change of current through resistor is 6 A/s. The value of L is A.

40

B. 60 C. 0 D. 100 A.

1H

Answer: Option A Explanation:

B. 2 H C. 3 H D. 4 H Answer: Option B Explanation: i = 18(1 - et/L) = 6;

View Answer Discuss in Forum Workspace Report

. Therefore, L = 2H.

14. The equivalent inductance seen at terminals A - B is A.

B.

C. A.

14 H D.

B. 20 H C. 10 H

Answer: Option D Explanation:

D. 4 H Answer: Option A Explanation:

Z parameter equations are

V1 = I1 Z11 + I2 Z12 V2 = I1Z21 + I2Z22

View Answer Discuss in Forum Workspace Report

. View Answer Discuss in Forum Workspace Report 16.

15. For the lattice circuit shown in the figure Za = j2 Ω and Zb = 2 Ω. The values of the

open circuit impedance parameters Z =

are

17. For the R-L circuit shown in the figure, the input voltage vi(t) = U(t). The

current i(t) is

18. If f(t) = - f(- t) and f(t) satisfies Dirichlet conditions, then f(t) can be expanded in Fourier series having A.

sine terms only

B. cosine terms only C. cosine and constant terms D. sine and constant term A.

B.

Answer: Option A Explanation: Since f(-t) = -f(t) only sine terms exist. View Answer Discuss in Forum Workspace Report

19. A parallel plate capacitor has plate area A and distance between the plates is d. It has two dielectrics each of thickness d and area 0.5 A. The dielectric constants are ∈1 and ∈2. The total capacitance is given by the equation A.

C. B.

C.

D.

D. Answer: Option A Explanation:

Answer: Option C Explanation: Vi(s) = 1/s

The combination is equal to two capacitors in parallel.

View Answer Discuss in Forum Workspace Report at t = ∞ i(t) = 1/2 = 0.5 . View Answer Discuss in Forum Workspace Report

20. Which of the following theorems can be conveniently 22. The used VTHtoatfind terminals A and B is equal to power consumed in 10 Ω resistor in figure?

A.

Thevenin theorem

A.

0V

B. Maximum power transfer theorem

B. 5 V

C. Millman's theorem

C. -5 V

D. Superposition theorem

D. none

Answer: Option D Explanation:

Answer: Option B Explanation:

Since the frequencies of the two sources are different onlyKVL to loop 1 Apply superposition theorem can be used. 5V - 3I1 - 2 (I1 - I2) - 5V = 0 View Answer Discuss in Forum Workspace Report ∴ I2 = 0 21. In the5V circuit figure - 5Vof - 5I I1 = 0 1 = 0 is ∴ VAB = 5 volt. View Answer Discuss in Forum Workspace Report

23. Consider the following If a network has impedance (1 - j) at a specific frequency, the circuit would A. I1 will always lag I3 consists of series B. 2 may 1. IR and be C in phase or lag I3 2. IR andalways L C. lag I2 3 will 3. IR, L and C D. 2 and I3 will be in phase Which of these statements is correct? Answer: Option C A. 1 and 2 Explanation: I3 is inductive current and must lag I2 which is B. current. 1 and 3 capacitive View Answer Discuss in C. 1, 2 and 3 Forum Workspace Report D. 2 and 3 Answer: Option D Explanation: RC circuit has impedance of the form (1 - j). Moreover R, L, C circuit can also have impedance of the form 1 - j if XC > XL. View Answer Discuss in Forum Workspace Report

24. Assertion (A): Power is the rate at which energy is supplied. Reason (R): Energy = VIt. A.

27. Two impedances 10 - j 10 and 10 + j 10 are connected in parallel. Their combined impedance is

Both A and R are true and R is correct explanation of A

A.

5 + j5

B. 5 - j5 Both A and R are true and R is B. not the correct explanation of A

C. 10 + j0

C. A is true but R is false

D. 20 - j10 Answer: Option C Explanation:

D. A is false but R is true Answer: Option A Explanation:

View Answer Discuss in Forum Workspace Report

. View Answer Discuss in Forum Workspace Report

28. Resistivity of semiconductors is around 100 Ω-m. 25. The circuit in figure, the switched on at t = 0. After a long time the current through 5 Ω A. True resistance is B. False Answer: Option B Explanation: Resistivity of semiconductors is about 1 ohm-m. A.

View Answer Discuss in Forum Workspace Report

1A

B. 4 A C. 10 A D. 0

29. Two capacitors of 20 μF each are in series. The total capacitance is

Answer: Option D Explanation: At t = ∞ inductance behaves as short-circuit. View Answer Discuss in Forum Workspace Report 26. If A = 3 + j1 and B = 4 + j3, A - B = A.

8.062 ∠29.7°

B. 10 ∠45°

A.

5 μF

B. 10 μF C. 40 μF D. 400 μF Answer: Option B Explanation:

C. 2.236 ∠243.43° D. 6.72 ∠243.43° View Answer Discuss in Answer: Option C Forum Workspace Report Explanation: A - B = - 1 - j2 = 2.236∠243.43°. View Answer Discuss in Forum Workspace Report

30. Thevenin's theorem is used to find current in a branch LetofRa =R It is now desired to find AB network. current in another branch of the network R = r + r || R A. the same Thevenin's circuit can be used R = 1.61r. View can Answer Discuss in B. the same Thevenin's circuit with some modification be used Forum Workspace Report C. it is necessary to find new Thevenin's circuit D. either (b) or (c)

33. A series resonant circuit has R = 2 Ω, L = 0.1 H and C =10 μF. At resonance applied voltage = 10 ∠0 V. Voltage inductance Thevenin's equivalent circuit with respect to particularacross terminals only. is likely to be Answer: Option C Explanation:

A. 10 ∠0 V View Answer Discuss in Forum Workspace Report 31. In the circuit of figure the current through 5 Ω resistance t =∠45° ∞ is V B. at10 C. 100 ∠90° V D. 100 ∠-90° V Answer: Option C Explanation: A.

Voltage across inductance = QV and leads the applied voltage.

0A

View Answer Discuss in Forum Workspace Report

B. 10 A C. 6.67 A D. 5.1 A Answer: Option A Explanation:

34. The admittance parameter Y12 in the 2 port network in the figure

The 5 ohm resistance is short-circuited by inductance. View Answer Discuss in Forum Workspace Report

32. In an infinite ladder Ckt as shown above each resistance of rΩ then RAB

A.

-0.2 mho

B. 0.1 mho C. -0.05 mho D. 0.05 mho A.

∞

B. C. 1.61 Ω D. none Answer: Option C Explanation:

Answer: Option B Explanation: I1 = y11 V1 + y12 V2 If V1 = 0 then

y12 =

V1 = 0

D. all Answer: Option A Explanation:

Under steady state, C will be open, Inductor short circuit out, due to low reactance path current will now due to ind

y12 = 0.1 mho. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

37. A series resonant circuit has parameters 35. The differential equation for the current i(t) in the Ckt is 10 ω, 1 H and 0.1 F. It is excited by a voltage v = 100 sin ωt. At resonant frequency, the power dissipated in the circuit is A.

1000 W

B. 707 W C. 500 W

A.

D. 414.14 W Answer: Option C Explanation:

B.

C. View Answer Discuss in Forum Workspace Report

D. Answer: Option C Explanation:

38. Assertion (A): A tree of graph contains all the nodes of the graph. Reason (R): The number of links is always less than the number of tree branches.

Apply KVL

A.

Both A and R are true and R is correct explanation of A

.

Both A and R are true and R is not the correct explanation of A View Answer Discuss in Forum Workspace Report 36. A 20 Ω resistor, a 1H inductor and 1μF capacitor are connected in parallel the combination is C. A is true but R isthrough false driven by a unit step current. Under the steady state, source current flows B.

A.

inductor

B. capacitor C. resistor

D. A is false but R is true Answer: Option C Explanation:

The number of links has no relation to number of tree branches. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

42. If Va = 10 ∠0, Vb = 10 ∠ -120° and Vc = 10 ∠ -240°, then Va2 and Va0 are A.

39. Cells are connected in series to increase A.

current-rating

B. both voltage and current rating C. the life of cell D. voltage rating Answer: Option D Explanation:

10 and 0 respectively

B. 0 and 10 respectively C. 0 and 0 D. 10 and 10 Answer: Option A Explanation: Since it is a balanced system of voltages, Va2 and Va0 must be zero. View Answer Discuss in Forum Workspace Report

When cells are in series, current remains the same but voltage increases. View Answer Discuss in Forum Workspace Report

43. A wire has a diameter d and resistance R. If the diameter is made 3d, the length and material remaining the same, the new value of resistance will be

A. R/3 40. The low pass filter characteristic shown in figure realizable. B. 3 R C. R/9 D. 9 R

A.

True

B. False Answer: Option B Explanation:

Answer: Option C Explanation: Since diameter is 3d, area of crosssection is increased 9 times. Therefore, resistance is R/9. View Answer Discuss in Forum Workspace Report

It is not realizable. 44. The realization of a reactance function View Answer Discuss in Forum Workspace Report 41. Assertion (A): The s domain impedance of a series gives R-L circuit is R + sL irrespective of initial conditions. a network having inductances A. Reason (R): Complex frequency s = σ + jω. only A.

Both A and R are true and R is correct explanation of A a network having capacitances B. only of A B. Both A and R are true and R is not the correct explanation C. A is true but R is false

C. a network having resistances only

D. A is false but R is true

D.

a network having inductances and capacitances only

Answer: Option D Answer: Option C Explanation: Explanation: The s domain equivalent depends on initial conditions. Both XL and XC are reactances.

View Answer Discuss in Forum Workspace Report

48. The filter in figure, uses ideal op-amp. It is

45. The correct relation between energy and charge is A.

Energy = voltage/charge

B. Charge = Energy x voltage C. Energy = voltage (charge)0.5 D. Energy = voltage x charge

A.

low pass filter

Answer: Option D B. high pass filter Explanation: Energy = V x I x t since I x t = Q, energy = voltage x charge. C. band pass filter View Answer Discuss in Forum Workspace Report 46. A two branch parallel tuned circuits has a coil of resistance D. band R and stop inductance filter L in one branch and capacitance C in the second branch. The bandwidth is 200 radians/sec. A load Answer: Option A of resistance RL is connected in parallel. The new bandwidth will be Explanation: A. 200 rad/sec Capacitor in shunt gives low pass filter. B. more than 200 rad/sec View Answer Discuss in C. less than 200 rad/sec

Forum Workspace Report

D. 200 rad/sec or less 49. For a rectified sinusoidal wave clipped at 0.707 its peak value (figure), the average value is Loading increases bandwidth of parallel tuned circuii. Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report

47. The correct relation between joules and calories is A.

calories = joules/4.156

B. joules = calories/4.156 C. calories = joules x 107/4.156

A.

D. joules = calories x 107/4.156

B. 63.7 V

Answer: Option A Explanation: Calories and joules are related by J, i.e., mechanical equivalent of heat. View Answer Discuss in Forum Workspace Report

70.7 V

C. 54 V D. 15 V Answer: Option C Explanation:

at t = 1 second is

A. View Answer Discuss in Forum Workspace Report

1 A/s

B. 0.63 A/s C. 0.37 A/s

50. A voltage v = 100 sin (100 t + 45°) V is applied to an 10 + j10 ohm. The current D.impedance 0 is Answer: Option C A. 10 ∠45° A Explanation: B. 7.07 ∠45° A C. 5 ∠45° A D. 5 ∠0 A Answer: Option D Explanation:

View Answer Discuss in Forum Workspace Report

Z = 200∠45°Ω ; 3. Assertion (A): Energy stored in inductance is

and that in

View Answer Discuss in Forum Workspace Report capacitance is 1. If P = 250 W and p.f. = 0.707 lagging, Q = Reason (R): Inductance and A. 250 vars capacitance are dual of each other. B. - 250 vars

A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. 176.7 vars D. - 176.75 vars Answer: Option A Explanation:

C. A is true but R is false D. A is false but R is true

Apparent power = positive.

Answer: Option A are taken as , Q = 250 vars and lagging vars Explanation:

View Answer Discuss in Forum Workspace Report In principle of duality L is dual of C and I is dual of V. 2. Figure shows an R-L circuit. The current is i = 1 - e-t. The rate of change of current

View Answer Discuss in Forum Workspace Report

4. The time constant of the circuit after the switch shown in the figure is opened is

Explanation: ωn = 10 2 ζωn = 4 ζωn = 2, and ζ =0.2 ωr = ωn1 - ζ2 ωr = 10 1 - ζ2 10 Bandwidth = 4 By comparing the formula View Answer Discuss in Forum Workspace Report

A.

0.2 s

B. 5 s C. 0.1 s dependent on R and hence cannot D. be determined unless R is known Answer: Option A Explanation: . View Answer Discuss in Forum Workspace Report

7. The temperature coefficient of copper is 0.00393 at 20° C. At 50° C the temperature coefficient is A.

0.0042

B. 0.0035 C. 0.0025 D. 0.0015 Answer: Option B Explanation: The temperature coefficient decreases slightly with increase in temperature. The equation is

5. A series RLC circuit is at resonance at 200 Hz. If capacitance is increased View Answer Discuss to in four times, the circuit will be in resonance at Forum Workspace Report A.

200 Hz

B. 400 Hz C. 100 Hz D. 800 Hz Answer: Option C Explanation:

8. To determine the polarity of voltage drop across a resistor, it is sufficient to know A.

direction of current through the resistor

B.

direction and magnitude of current through the resistor

. If C becomes four times, f is reduced to C. half. direction and magnitude of current and value of resistance View Answer Discuss in Forum Workspace Report 6. A system function bandwidth in rad/sec. is given by A.

10 and 1

B. 10, 4 C. 100, 5 D. 10, 10 Answer: Option B

magnitude of current through the D. frequency in rad/sec and the resonant resistance Answer: Option A Explanation: Polarity of voltage depends only on direction of current and nothing else. View Answer Discuss in Forum Workspace Report

9. A sawtooth current wave is passed through a resistance A.

the waveshapes of voltages across resistance and power will also the sawtooth

B.

the waveshape of voltage across resistance will be sawtooth

C.

the waveshape of power will be sawtooth

12. Two passive elements are connected in series and a dc voltage is applied to the circuit. The time variation of the current is shown in figure. The two elements are

neither the voltage waveshape D. nor power wave-shape will be sawtooth Answer: Option B Explanation: V = IR and P = I2R. Therefore, waveshape of V is the same as that of I but waveshape of P is different. View Answer Discuss in Forum Workspace Report

A.

one resistance and the other inductance

B. both resistances C.

one inductance and the other capacitance

D.

one resistance and the other capacitance

Answer: Option A 10. Which of the following is the poorest conductor of electricity? Explanation: A. Copper In an RL circuit excited from dc source the current rises exponentially with a B. Aluminium C. Manganin

time constant

D. Nichrome

View Answer Discuss in Forum Workspace Report

Answer: Option D Explanation: Nichrome has highest resistivity.

13. Which statement is incorrect for parallel View Answer Discuss in Forum Workspace Report resonance? 11. Assertion (A): If A = 0.5 ∠ 20°, A2 = 0.25 ∠ 40°. A. P.f. is 1 Reason (R): When drawing a phasor diagram, sinusoids may have the same or different frequencies. B. Y is minimum A.

Both A and R are true and R is correct explanation of A C. B is zero

B. Both A and R are true and R is not the correct explanation of A D. Z is minimum C. A is true but R is false D. A is false but R is true Answer: Option C Explanation:

Answer: Option D Explanation: At parallel resonance Z is maximum and Y is minimum.

View Answer Discuss in In a phasor diagram all phasors must be of the sameForum frequency. Workspace Report View Answer Discuss in Forum Workspace Report

14. If a capacitor is charged by a square wave current source the voltage across the capacitor is A.

triangular wave

Earthing prevents electric shock because the fault curren and not through body. View Answer Discuss in Forum Workspace Report

B. step function C. zero D. square wave Answer: Option A Explanation: Capacitor will behave as integrator. View Answer Discuss in Forum Workspace Report

17. Three impedances (3 + j 4) Ω each are connected in star. The impedances of equivalent delta circuit will be A.

3 - j 4 Ω each

B. 9 + j 12 Ω each C. 9 - j 12 Ω each D. 3 + j 4, 3 - j 4 and 4 - j 3 Ω

Answer: Option B Explanation: 15. The equivalent resistance between terminals x and y figure is

View Answer Discuss in Forum Workspace Report

18. Find Vth in the circuit

A.

150 Ω

B. 45 Ω C. 55 Ω

A.

D. 35 Ω

B. 10 V

Answer: Option D Explanation: Use star-delta conversion.

100 V

C. 0 V D. 5 V

Answer: Option C View Answer Discuss in Forum Workspace Report Explanation: 16. The purpose of earthing electric appliances is There is no independent source hence VTH = 0. A. to provide safety against shock View Answer Discuss in B. to ensure that appliance works satisfactorily Forum Workspace Report C. to ensure that appliance gets full voltage D. all of the above Answer: Option A Explanation:

19. A heater is rated at 230 V, 5 A AC. Then A.

both the current and voltage are peak values

B.

both the current and voltage are rms values

B. L1 + L2 - M C. L1 + L2 + 2M

the current is peak value and C. voltage is rms value D.

D. L1 + L2 - 2M Answer: Option D Explanation: L = L1 + L2 - 2M because currents are opposing. View Answer Discuss in Forum Workspace Report

the current is rms value and voltage is peak value

Answer: Option D Explanation: In heaters, the ratings are specified in terms of rms values. View Answer Discuss in Forum Workspace Report

23. A dc network has 3 independent nodes and 4 loops. In total analysis, the number of equations is

A. 4 20. KCL is a statement of principle of conservation of energy. B. 3 A. True B. False Answer: Option B Explanation:

C. 2 D. 1

Answer: Option C Explanation: KCL is restatement of principle of conservation of charge. View Answer Discuss in Forum Workspace Report The number of nodal equations is one less thanisthe of independent 21. In an underdamped RLC series circuit, the natural frequency ωnnumber . The frequency of nodes. damped oscillations is A.

ωn

B. less than ωn

View Answer Discuss in Forum Workspace Report

C. more than ωn

24. In the circuit, S was initially open. At time t = 0, S is closed. When the current through the inductor is 6 A, the rate of Answer: Option B change of current through the resistor is Explanation: 6 A/s. The value of the inductor would be In underdamped circuit the frequency of oscillations is less than resonant frequency. D. 2 ωn

View Answer Discuss in Forum Workspace Report

22. The equivalent inductance measured between the terminals 1 and 2 for the circuit shown in the figure is A.

1H

B. 2 H C. 3 H D. 4 H A.

L1 + L2 + M

Answer: Option B Explanation:

i = 18(1 - e-t/L) ...(1) 6 = 8 (1 - e-t/L) 1 = 3 (1 - e-t/L) -t/L 1=3-3e 2V2 - V1 = 0 e-t/L = 2/3

V2 = 4 V1 = 8 Is = x 8 - 4 = 6A. View Answer Discuss in Forum Workspace Report

from (1)

. View Answer Discuss in Forum Workspace Report

V1 = 2V2

27. A current of 1 A in the coil of an iron cored electromagnet causes B = 0.5T. If current is 2A, B = A.

0.5 T

B. 1 T 25. A series circuit has R = 5 Ω and C = 10 μF. It is switched 12 V dc battery at t = 0. The C. on 1 Ttoora more current in the circuit will be maximum D. 1 T or less A. at t = RC Answer: Option D B. at t = ∞ Explanation: C. at t = 0+

If saturation starts B will be less than it.

D. none of the above

View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: 28. In RC circuit excited by a dc battery of voltage E, View Answer Discuss in Forum Workspace Report 26. If V = 4 in the figure, the value of Is is given by

Two current sources each of rms value +. and is maximum at t = 10 A have frequencies 40 Hz and 500Hz respectively. They are connected in series, the expression for resultant wave is A.

i = 10 sin 40 t + 10 sin 50 t

B. i = 14.14 sin 40 t + 14.14 sin 50 t C. A.

6A

B. 5/2 A C. 12 A D. none Answer: Option A Explanation: At node V1

at node V2

i = 14.14 sin 80 t + 14.14 sin 100 t

D. i = 20 sin 80 t + 20 sin 100 t Answer: Option C Explanation: Peak value = 14.14 A; ω1 = 2 x 40, ω2 = 2 x 50 View Answer Discuss in Forum Workspace Report

29. To find the current in a 20 Ω resistance connected in a circuit, Norton's theorem is used. IN = 7.5 A. The current though 20 Ω resistance.

A.

Source current Is = iC (t) + iR(t) 120 e-2t - 20e-2t 100 e-2t -2t VR = 100 e

is 7.5 A

B. is less than 7.5 A C. may be 7.5 A or less D. may be 7.5 A or more or less

33.33 e-2t, Vs = 100 e-2t - 20 e-2t - 33.33 e-2t Vs = 46.6 e-2t volt. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: Norton's equivalent is as shown in figure. Some current will flow through RN. There-fore, current through 20Ω resistance is less than 7.5 A.

32. In an R-L-C series circuit, R = 2/L/C . If R is doubled

View Answer Discuss in Forum Workspace Report

A.

the response will become underdamped

B.

the response will become overdamped

C.

the response will be critically damped

D.

the response may be under damped or overdamped

Answer: Option B 30. While calculating Norton's resistance, all current sources are short circuited. Explanation: A.

True

Increase of resistance increases damping.

B. False

View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: All current sources are open circuited.

33. The Gaussian filter characteristic figure View Answer Discuss in Forum Workspace Report is realizable. 31. The voltage of the source in circuit shown __________ if i(t) = - 20e-2t is

A.

46.6 e-2t A.

B. 47 e-2t

B. False

C. 50 e-2t D. 0 Answer: Option A Explanation: Voltage across capacitor = i(t) x 1 Current across capacitor =

True

- 20 e-2t 120 e-2t

Answer: Option B Explanation: It is realizable because |log|H(jω)|| = ω2. View Answer Discuss in Forum Workspace Report

34. A coil of resistance R and inductance L is connected in series with 10 mF capacitor. The resonant frequency is 1000 Hz. Another 10 F capacitor is connected in parallel with the above capacitor. The new resonance frequency will be A.

1000 Hz

B. more than 1000 Hz C. less than 1000 Hz D.

A.

1

B. 2 C. 3 D. 4/3 Answer: Option A Explanation:

If steady is reached L will be short circuited the current in It will act as current source in parallel with inductor.

may be more or less than 10000 Hz

Answer: Option C Explanation: Total capacitance increases and therefore ωr decreases. View Answer Discuss in Forum Workspace Report

Now apply superposition theorem consider 4 volt source, 35. The circuit is figure, is in steady state with switch closed. At t also = 0 switch inductor open. is opened. The current i is Current in R' = 1 Ω resistor = 2A.

When current source consider, voltage source will be sho inductor is 1A in opposite direction. Total current 2 - 1 = 1 A. View Answer Discuss in Forum Workspace Report

A.

B.

37. The value of the inductance of coil in which a current increases linearly from zero to 0.1A in 0.2 second producing a voltage of 5 volts is __________ . A.

C.

2.5

B. 5 C. 10

D. Answer: Option B Explanation:

D. 20 Answer: Option C Explanation: 10 =

The initial current through inductance is L

L = 10 H.

View Answer Discuss in Forum Workspace Report Answer Discuss 36. In the circuit shown, the steady state is reached with View S open S is closed at in t = 0, the current I in the 1 Ω resistor connected is to be determined at tForum = 0+ is Workspace given by Report

38. An RLC series circuit is excited by an ac voltage v = 1 sint. If L = 10 H, C = 0.1 F peak value of voltage across R is A.

0.707 V

D. four times Answer: Option C Explanation:

B. 1 V

Since diameter is doubled, area of cross-section become inversely proportional to area of cross-section.

C. 1.44 V

View Answer Discuss in Forum Workspace Report

D.

indeterminate as value of R is not given

Answer: Option B Explanation:

42. A series resonant circuit has R = 10 Ω, L = 1 μH and C = 1 mF. If R is increased to 20 Ω the resonant frequency

It is a series resonant circuit and peak voltage across R is equal to peak value of source voltage.

A.

increases

View Answer Discuss in Forum Workspace Report

C. remains constant

B. decreases

D. may increases or decreases 39. If all other parameters are the same, a capacitor with mica as dielectric has higher capacitance than air capacitor. A.

True

Answer: Option C Explanation: fr depends only on L and C. View Answer Discuss in Forum Workspace Report

B. False Answer: Option A Explanation: C ∝ ∈r . View Answer Discuss in Forum Workspace Report

43. Assertion (A): Two terminal black boxes of R and C can be identified by plotting their static V-I characteristics. Reason (R): The V-I characteristic of resistance is a straight line of slope R passing through origin. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

40. If V = 100 ∠ 16°, the (V) is A.

10 ∠ 32°

B. 10 ∠ 8° C. A is true but R is false C. 10 ∠ 16° D. A is false but R is true D. 10 ∠ 4° Answer: Option B Explanation:

Answer: Option D Explanation: A is wrong because static V-I characteristics do not identify the elements.

View Answer Discuss in Forum Workspace Report View Answer Discuss in 41. As the diameter of a wire is doubled, the resistance becomes Forum Workspace Report A. twice B. one half C. one fourth

44. In figure, VAB =

A.

46. For the wave shown in figure, the average value is

A.

6V

14.14 A

B. 10 V

B. 15 A

C. 25 V

C. 17.17 A

D. 40 V

D. 19.19 A

Answer: Option D Explanation:

Answer: Option B Explanation:

Use superposition theorem.

Average value = 10 + 0.5 x 10 = 15 A.

View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

45. In figure, the effective resistance across AB is

47. The dc voltage applied to an R-L series circuit is suddenly changed from V1 to V2. The expression for transient current is A.

B.

A.

R

C.

B. R - 1 D. either (a) or (c) C. R/2

Answer: Option C Explanation:

D. Answer: Option C Explanation: Convert the inner star into delta. View Answer Discuss in Forum Workspace Report

The final steady state current is and transient term must depend on both V1 and V2. View Answer Discuss in Forum Workspace Report

48. One ampere means the flow of A.

One coulomb each minute

B. One electron per second C. One coulomb per second

D. One coulomb each hour

B. 180°

Answer: Option C Explanation:

C. 270°

As per definition one ampere means 1 coulomb per second.

D. 360°

View Answer Discuss in Forum Workspace Report

Answer: Option D Explanation:

Sum of phasors is maximum if they are in phase and 360 View Answer Discuss in Forum Workspace Report

49. For the following circuit a source of V1(t) = e-2t is applied, then the resulting response V2(t) is given by

2. A current of 1 A in the coil of an iron cored electromagnet cause a flux density of 0.2.T. If the current is 2 A, B= A.

0.2 T

B. 0.4 T C. 0.4 T or less A.

e-2t + e-t

B. e-t C. e-t - e-2t D. Answer: Option C Explanation:

D. 0.4 T or more Answer: Option B Explanation: In air cored coil flux density increases linearly with current because there is no saturation. View Answer Discuss in Forum Workspace Report

3. If the L.T. of the voltage across a capacitor of value 1/3 F . View Answer Discuss in Forum Workspace Report

is , then the value of the current through the capacitor at t = 0+ is

A. 0 50. When R and C are connected in parallel, phase angle of Y is positive. B. 1 A. True B. False Answer: Option A Explanation:

C. 1/3 D. ∞

Answer: Option C I = YV. Since I leads V, phase angle of Y must be positive. Explanation: t → 0+ s → ∞ and s3 >> s2 >> s >> 1 View Answer Discuss in Forum Workspace Report 1. Two phasors having rms values V1 and V2 which are added to give a phasor having rms value V3. V3 is maximum if phase angle between V1 and V2 is A.

90°

B. zero C. 4 Amp D. 8 Amp

.

Answer: Option A Explanation:

View Answer Discuss in Forum Workspace Report

V must be given. 4. In figure, the current I4 is

View Answer Discuss in Forum Workspace Report 6. The current voltage relation for an inductance L is A.

B.

C.

A.

D.

10 ∠0

B. 5 ∠90°

Answer: Option A Explanation:

C. 5 ∠270° D. 10 ∠90° Answer: Option B Explanation: I4 = I1 + I2 + I3 or I4 = 5∠90° + 5∠0 + 5∠180° = 5∠90°. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

7. A band elimination constant k filter has series resonant circuit in series arms. 5. For the circuit shown in the figure, the current I is

A.

True

B. False Answer: Option B Explanation: It has parallel resonant circuit in series arms. View Answer Discuss in Forum Workspace Report A.

indeterminate due to indeterminate data

8. If e = 110 sin (ωt + /3) and i = 5 sin (ωt - /3), the impedance of the circuit is A.

11. In figure, the steady state current through 1H inductance

22 Ω

B. 16 Ω C. 30.8 Ω D. 11 Ω Answer: Option A Explanation:

A.

Zero

B. 3 A View Answer Discuss in Forum Workspace Report

9. Two sinusoidal waves 1 and 2 have peak values Vm1 and Vm2. Wave 1 is leading wave 2 by ∠θ. Which of the following is correct? A.

v1 = Vm1 sin θ and v2 = Vm2 cos θ

B.

v1 = Vm1 sin ωt and v2 = Vm2 sin (ωt - θ)

C.

v1 = Vm1 sin (ωt + θ/2) and v2 = Vm2 sin ωt

C. 5 A D. 6 A Answer: Option B Explanation: In steady state inductance behaves as short-circuit. View Answer Discuss in Forum Workspace Report

12. Impedance Z as shown in the given figure is

D. none of the above Answer: Option B Explanation: A leading B means B lagging A by ∠Q.

A.

View Answer Discuss in Forum Workspace Report

B. j9 Ω

j29 Ω

C. j19 Ω 10. Ohm's law is valid for A.

dc voltage and current

B. ac voltage and current C. all voltages and current

D. j35 Ω Answer: Option B Explanation: Z = j5 + j2 + j2 + 20j - 20j = 9jΩ. View Answer Discuss in Forum Workspace Report

D. dc and ac voltages and currents Answer: Option C Explanation:

13. A resistance R, inductance L and capacitance C are in series. The source frequency is adjusted to be equal to KCL and KVL are valid for voltages and currents of all wave shapes during transient as well resonant frequency. The lower half as steady state conductions. power frequency is ω1. Another View Answer Discuss in Forum Workspace Report resistance R is added in series with the

circuit. The new lower half power frequency will be A.

ω1

B. less than ω1 C. more than ω1 D.

B. 0.1 Ω C. 0.05 Ω D. 0.1 Ω Answer: Option B Explanation:

either more than ω1 or less then ω1

Answer: Option C Explanation: As R increases, Q decreases,

View Answer Discuss in Forum Workspace Report 16. In figure the open circuit emf is

bandwidth = . Therefore, bandwidth increases. Hence lower half power frequency will be less than ωr. View Answer Discuss in Forum Workspace Report

14. The strength of controlled voltage source depends on A.

value of current elsewhere in the circuit

B.

value of voltage elsewhere in the circuit

C.

value of current or voltage elsewhere in the circuit

D. none of the above

A.

15 V

B. 1.45 V C. 1.475 V D. 1.485 V Answer: Option C Explanation:

Since emfs of two cells are not equal, a circulating curren

Answer: Option C Explanation: A controlled voltage source may be a voltage source or current source and its strength may depend on another voltage or current. View Answer Discuss in Forum Workspace Report

. OC emf = 1.5 - (0.25)(0.1) = 1.475 V. View Answer Discuss in Forum Workspace Report

17. In a practical current source, the load current A.

is always equal to source current

15. In figure, the value of R should be B. is always less than source current

A.

0.2 Ω

C.

is always equal to or less than source current

D.

cannot be higher than source current

Answer: Option B Explanation:

In a current source the source resistance is in parallel with the source. Some current flows through this source resistance.

D. none Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report

18. If A.

B.

C. .

D. Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report

20. A resistor R of 1 Ω and two inductor L1 and L2 of inductan connected in parallel. At some time, the current through L respectively. The current through R at time t = ∞ will be A. View Answer Discuss in Forum Workspace Report

zero

B. 1 A C. 2 A D. 3 A

19. The pole zero diagram of an impedance Z has a pole at s = - 6 and zero at s = - 4 as shown in figure the constant multiplier k = 1. For a signal Is = cos 6t, the steady state voltage across Z is given in magnitude as under

A.

0.6

B. 0.84 C. 7.2

Answer: Option A Explanation: Resistor will get short circuited. View Answer Discuss in Forum Workspace Report 21. In the circuit of figure the current through 5 Ω resistance

A.

0A

B. 10 A

C. 6.67 A

B. False Answer: Option B Explanation:

D. 5.1 A Answer: Option C Explanation:

A non-linear element has a resistance which depends on the magnitude of Current through inductance is zero. Current through current. 5 ohm resistance = A. View Answer Discuss in Forum Workspace Report View Answer Discuss in Forum Workspace Report 22. In an R-L circuit excited by a battery of voltage E, the current and voltage across resistor are 1- e-t and 2(1 - e-t) respectively. If there were an initial current of 2 A in the inductance, the voltage across resistance would have been A.

1-e

25. In a RL circuit, the angle, θ by which the current lags the A.

B. 90° C. 0°

-t

D. 0 < θ < 90°

B. 2 - 2e-t

Answer: Option D Explanation:

C. 2 + 2e-t

In RL circuit the current lags the voltage by an angle whic 90°.

D. 4 - 4e-t Answer: Option C Explanation: From the given data R = 2Ω, L = 2H and E = 2V. Because of initial current of 2A, i(t) = 1 - e-t + 2e-t = 1 + e-t. Therefore, VR = 2(1 + e-t). View Answer Discuss in Forum Workspace Report

23. Stray capacitance is important at low frequencies. A.

0 > θ > - 90°

View Answer Discuss in Forum Workspace Report 26. v-i relation for a capacitor is A.

True

B. False Answer: Option A Explanation:

True .

B. False Answer: Option B Explanation: At high frequencies the reactances of stray capacitance is small. Therefore stray capacitance assumes importance at high frequencies.

View Answer Discuss in Forum Workspace Report

27. The time constant of the circuit in figure is

View Answer Discuss in Forum Workspace Report

24. A non-linear element has zero resistance. A.

True

A.

6 sec

B. 10 sec

C. D. 16 sec

View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation:

30. In an ideal current source, the source resistance is zero. A.

True

B. False Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report

In ideal current source, the source resistance is infinite. 28. The damping coefficient for the given circuit is __________

View Answer Discuss in Forum Workspace Report 31. A choke coil has a resistance to reactance ratio of 0.2. T A.

less than 0.2 lagging

B. less than 0.2 leading C. about 1 D. about 0 A.

Answer: Option A Explanation:

1/2

B. 1/4

Therefore, cos Ω = 0.196 lag

C. 2

View Answer Discuss in Forum Workspace Report

D. 1 Answer: Option A Explanation: Damping coefficient 1/2.

σ=u

32. For the ladder network of figure, open circuit driving point impedance at port 1 =

View Answer Discuss in Forum Workspace Report

29. A 60 W, 23 V bulb is used for 45 minutes. The electrical energy consumed in commercial units is A.

A.

2700 units

B. 0.45 units C. 4.5 units D. 0.045 units Answer: Option D Explanation:

B.

Explanation: Since capacitors are in series, charge will be same.

C.

View Answer Discuss in Forum Workspace Report D.

35. A series RLC circuit has Q = 5. A voltage of 10 V rms is a voltage across C is Answer: Option D Explanation: s domain impedance of each inductance

A.

= 2s and that of each capacitor is View Answer Discuss in Forum Workspace Report

C. 50 V rms

.

33. If Va0, Va1, Va2 are sequence components of Va and Ia0, Ia1, Ia2 are sequence components of Ia, then total 3 phase power P is given by A.

P = Va0Ia0 + Va1Ia1 + Va2Ia2

B. P = Va0Ia0 + Va1Ia1 + Va2Ia2* C. P = 3(Va0Ia0 + Va1Ia1 + Va2Ia2) D. P = 3(Va0Ia0 + Va1Ia1 + Va2Ia2*) Answer: Option D Explanation: There are a total of 9 components (Three for each phase). Moreover, in general, P = VI*. View Answer Discuss in Forum Workspace Report

10 V rms

B. 10 V peak

D. 50 V peak Answer: Option C Explanation: VC = QV = 50 V rms. View Answer Discuss in Forum Workspace Report 36. The pole of a reactive function A.

lie on jω axis only

B. lie on negative real axis only C. may lie anywhere on s plane D. lie on jω axis or on negative real axis

Answer: Option A Explanation: A reactance function means that the network is compose resistance, poles lie on jω axis only. View Answer Discuss in Forum Workspace Report

37. In the circuit of figure the current through 3 Ω resistance at t = 0+ is

34 Two capacitors of 1 μF and 2 μF are . connected in series across a 10 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be A.

10 μC each A.

4A

B. 20 μC each B. 2.5 A C. 10 μC and 20 μC C. 3.1 A D. 20 μC and 10 μC Answer: Option B

D. 0

Answer: Option D Explanation: The 3Ω resistance is short-circuited by capacitor at t = 0. View Answer Discuss in Forum Workspace Report

38. Wave A starts its positive half cycle at ωt = 30° and wave B starts its positive half cycle at ωt = 75° then wave B is leading wave A by 45°. A.

True

B. False Answer: Option B Explanation: B is lagging A by 45°. View Answer Discuss in Forum Workspace Report

39. Assertion (A): For networks in figure (1) and (2) sum of products of branch voltages and branch currents at any time is zero. Reason (R): The networks in figure (1) and (2) are not the same structurally.

A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

B. 3 A C. 3.6 A D. 1.5 A Answer: Option B Explanation:

Inductance does not allow the current to change instanta 36. The pole of a reactive function A.

lie on jω axis only

B. lie on negative real axis only C. may lie anywhere on s plane D. lie on jω axis or on negative real axis

Answer: Option A Explanation: A reactance function means that the network is compose resistance, poles lie on jω axis only. View Answer Discuss in Forum Workspace Report

37. In the circuit of figure the current through 3 Ω resistance at t = 0+ is

A.

4A

B. 2.5 A

C. A is true but R is false

C. 3.1 A

D. A is false but R is true

D. 0

Answer: Option C Explanation: A is statement of Tellegen's theorem while R is wrong. View Answer Discuss in Forum Workspace Report

Answer: Option D Explanation: The 3Ω resistance is short-circuited by capacitor at t = 0. View Answer Discuss in Forum Workspace Report

38. Wave A starts its positive half cycle at ωt =At30° B starts its positive 40. In the circuit of figure the switch is open for a long time, t = and 0 thewave switch is closed. At t = half cycle at ωt = 75° then wave B is 0+ the current supplied by battery is leading wave A by 45°. A. A.

6A

True

B. False

A.

Both A and R are true and R is correct explanation

Answer: Option B Explanation:

B. Both A and R are true and R is not the correct expl

B is lagging A by 45°.

C. A is true but R is false

View Answer Discuss in Forum Workspace Report

D. A is false but R is true

39. Assertion (A): For networks in figure (1) and (2) sum of products of branch voltages and branch currents at any time is zero. Reason (R): The networks in figure (1) and (2) are not the same structurally.

A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

Answer: Option C Explanation: Integral of unit impulse gives unit step function. View Answer Discuss in Forum Workspace Report

42. An RL series circuit is initially relaxed. A step voltage E is applied. If  is time constant, voltage across R and L will be equal at t = A.

 ln 2

B. C.

D. A is false but R is true Answer: Option C Explanation: A is statement of Tellegen's theorem while R is wrong. View Answer Discuss in Forum Workspace Report

D. Answer: Option B Explanation: vR = E(1 - e-t/) and vL = E e-t/t or 1 - et/t = e-t/t. This happens at t =  in 2. View Answer Discuss in Forum Workspace Report

40. In the circuit of figure the switch is open for a long time, At t = 0 the switch is closed. At t = 43. For the two port of figure, z11 is 0+ the current supplied by battery is

A.

6A

B. 3 A C. 3.6 A D. 1.5 A Answer: Option B Explanation:

A.

26/7 Ω

B. 10/3 Ω

C. 6 Ω Inductance does not allow the current to change instantaneously. View Answer Discuss in Forum Workspace Report D. 2 Ω 2. 41. Assertion (A): The Laplace transform of a ramp is 1/s Answer: Option A Reason (R): The integral of a unit step function givesExplanation: an impulse function.

C. 0.5 V2C D. 0.5 C2V View Answer Discuss in Forum Workspace Report

44. A certain network has two ideal voltages sources and a large number of ideal resistances. The power consumed in one of the resistances is 4 W when either of two sources is active and the other source is active and the other source is short circuited. When both sources is short circuited.When both sources are active, the power consumed in the same resistor would be A.

Answer: Option C Explanation: Energy stored = 0.5 CV2 View Answer Discuss in Forum Workspace Report

47. If the  and T circuits in figure are equivalent, then R1, R2, R3 respectively are

zero or 16 W

B. 4 W or 8 W

A.

9 Ω, 6 Ω, 6 Ω

C. zero or 8 W

B. 6 Ω, 6 Ω, 9 Ω

D. 8 W or 16 W

C. 9 Ω, 6 Ω, 9 Ω

Answer: Option A Explanation: If currents of both sources add, total current would be twice and power is four time, i.e., 16 W. If currents subtract, net current and power are zero. View Answer Discuss in Forum Workspace Report

D. 6 Ω, 9 Ω, 6 Ω Answer: Option B Explanation: Find R1, R2, R3 by delta star conversion. View Answer Discuss in Forum Workspace Report

48. In an R-L circuit, the impedance is 30 Ω 45. A coil of resistance R and inductance L is connectedat in aseries with 5ofμF capacitor. TheHz, the frequency 100 Hz. At 200 source frequency is equal to resonance frequency and circuit current is 0.5 A. Another 5F impedance should be capacitor is connected in parallel with the above capacitor. The circuit current will be A. 30 Ω or more A. 0.5 A B. 60 Ω or more B. more than 0.5 A C. 15 Ω or less C. less than 0.5 A more than 30 Ω but less than 60 D. D. 0.5 A or less Ω Answer: Option C Answer: Option D Explanation: Explanation: 2)0.5. Z =Therefore, (R2 + ω2Lcurrent Since C increases, the circuit will not be in resonance. decreases (In View Answer Discuss in series resonant circuit current is maximum at resonance). Forum Workspace Report View Answer Discuss in Forum Workspace Report 46. A capacitor having capacitance C is raised to voltage V. The energy stored will be

A.

CV2

B. V2/C

49. In the circuit, Vs = 10 cos ωt, power drawn by the 4Ω resistor is 8 watt. The

power factor is

D. 5 kΩ, 0.1 mH, 0.4 μF

Answer: Option B Explanation: If L = 0.2 mH and C = 200 pF, ω0 = 5 x 106 rad/sec and if View Answer Discuss in Forum Workspace Report

2. In figure, the total power consumed is A.

1

B. 0.5

A.

C. 0.85

B. 12 W

D. 0

C. 16 W

Answer: Option C Explanation: I2m = P/R

D. 20 W Answer: Option A Explanation:

Im = 2

Total power drawn =

I2R

10 W

x 2 x [4 + 2]

Use superposition theorem. 6

View Answer Discuss in Forum Workspace Report

VmIm cos θ = 6 x 10 x 2 x PF = 6 P.F = 0.85 . View Answer Discuss in Forum Workspace Report

3. If operator 'a' = 1 ∠120° then (1 + a) = A.

-a

B. -a2

C. a 50. The electric energy required to raise the temperature of a given amount of water is 1000 -1 is __________ kWh. kWh. If heat losses are 25%, the total heating energy D. required A.

1500

B. 1250 C. 1333

Answer: Option B Explanation: Since 1 + a + a2 = 0, 1 + a = - a2. View Answer Discuss in Forum Workspace Report

D. 1000 Answer: Option B Explanation:

4. A current wave is i = 100e-60t The initial and final values of current are

Total heating energy required = 1000 kWh + 25% of 1000 kWh.and 50 A. 100 1. The circuit in figure, is to be scaled to an impedance level of 5kΩ B. 100 andand 0 resonant frequency of 5 x 106 rad/sec. The possible combination of R, L, C is C. 0 and 100 A.

2.5Ω, 0.2 mH, 200 pF

B. 5 kΩ, 0.2 mH, 200 pF C. 5 kΩ, 0.2 mH, 200 μF

D. 100 and 100 Answer: Option B Explanation: i(0) = 100 e-0 = 100, i(∞) = 100 e-∞ = 0. View Answer Discuss in Forum Workspace Report

C. 1.5 Ω 5. Assertion (A): The impedance of a series resonant circuit is minimum at resonance. D. 0.5 Ω Reason (R): Resonance condition implies unity power factor condition. Answer: Option B A. Both A and R are true and R is correct explanation of A Explanation: B. Both A and R are true and R is not the correctThe explanation of A 8 ohm and 2 ohm current through C. A is true but R is false D. A is false but R is true Answer: Option A Explanation:

resistances is

A or 1 mA.

Therefore, current through (5 + R) ohm is 1.25 mA.

Since power factor is unity, impedance is minimum.View Answer Discuss in Forum Workspace Report View Answer Discuss in Forum Workspace Report 6. In the circuit of figure the switch is closed at t = 0, At t = 0+ this current through inductance is 8. The sum of positive real functions A.

is a positive real function

B.

may be a positive real function or not

C. can not be a positive real function A.

0

B. 10 A C. 6.67 A D. 5.1 A Answer: Option A Explanation:

D. either (b) or (c) Answer: Option C Explanation: It is a property of positive real functions. View Answer Discuss in Forum Workspace Report

Current through an inductance cannot change instantaneously. 9. Twelve 1 Ω resistance are used as View Answer Discuss in Forum Workspace Report edges to form a cube. The resistance between two diagonally opposite corners of the cube is 7. In the circuit of figure, the source supplies, A. 5/6 Ω 2.25 mA. The value of R must be B. 1 Ω C. 6/5 Ω D. 3/2 Ω Answer: Option A Explanation:

A.

5Ω

B. 3 Ω

. View Answer Discuss in Forum Workspace Report

C. 6 V D. 9 V Answer: Option A Explanation:

In steady state inductance is short10. A parallel RLC circuit has ω0 = 106 and Q = 30, Given C = 30and pF, capacitance the value of R circuited is is open circuited. Current through 6Ω resistance A. 0 B. 1 μΩ

=

C. 2 MΩ

View Answer Discuss in Forum Workspace Report

D. 1 MΩ Answer: Option D Explanation:

and

13. A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is A.

.

10 sin (200t + 90°)

B. 10 sin (200t - 90°)

View Answer Discuss in Forum Workspace Report C. 10 sin(1000t + 90°) 11. An m derived low pass filter has fc = 1000 Hz and m = 0.6. This filter will have infinite attenuation at D. 10 sin (1000t - 90°) A.

f = 1250 Hz

B. all frequencies above 1000 Hz C. f = 1562.5 Hz D. f = 1666.67 Hz Answer: Option A Explanation:

Answer: Option D Explanation: Z = jXL = jωL = = 1∠90° and V = IXL View Answer Discuss in Forum Workspace Report

14. In figure, capacitor is used to develop pulses of short duration and large duty For m derived low pass filter View Answer Discuss in Forum Workspace Report cycle across R2 when switch is closed. Which of the following combinations is best suited? 12. In figure, i(t) is a unit step current. The steady state value of v(t) is

A.

R1 and R2 large but C small

B. R1 and R2 small but C large A.

2V C. R1 and C large and R2 small

B. 3 V D. R2 and C large but R1 small

Answer: Option C Explanation: Large values of R1 and C mean large time of charging C and hence large duty cycle. Small value of R2 ensures that duration of pulses is small. View Answer Discuss in Forum Workspace Report

the current I at t = 0+ is given by

A.

9Ω

15. In figure, which value of ZL will cause maximum powerB.to be 6 Ωtransferred to the load? C. 7 Ω D. 10 Ω

A.

2 + j2 Ω

Answer: Option C Explanation: When steady state is reached with s open, capacitor will act as open circuit

B. 2 - j2 Ω C. - 2 Ω D. 2 Ω Answer: Option D Explanation: As seen from ZL, the circuit impedance = 16.

Current in 4Ω resistor will be = 6A at steady state. A wave trap is a Voltage across 4Ω = 6 x 4 24 volt. A. series tuned circuit Current in 2Ω resistor due to 6A 3A a parallel tuned current due to 16B.V, source. circuit either a series I = 16/2 8A, this tuned or current divide in C. (2 + 2) Ω iscircuit 4Ω resistor parallel tuned current in 2Ω resistor 4A + 3A 7A. circuit View Answer Discuss in D. Report none of the above Forum Workspace Answer: Option B Explanation: 18. In an ac series RLC circuit the maximum It has R andany L intwo one phase difference between branch and a variable voltages can be capacitance in second A. 90° branch. B. 45°

View Answer Discuss in Forum Workspace Report

C. - 90° 17. In following circuit, steady state is reached with S open, S is closed at t = 0,

D. 180° Answer: Option D

Explanation: Voltage across inductance leads the current by 90° and voltage across capacitance lags the current by 90°. View Answer Discuss in Forum Workspace Report

19. In a series circuit with XL constant and R variable the current locus lies in the third quadrant. A.

View Answer Discuss in Forum Workspace Report

22. The internal impedance of a source is 3 + j 4 Ω. It is desired to supply maximum power to a resistive load. The load resistance should be A.

B. 4 Ω

True

C. 7 Ω

B. False Answer: Option B Explanation:

D. 5 Ω Answer: Option D Explanation: RL = 32 + 42. View Answer Discuss in Forum Workspace Report

it lies in fourth quadrant. View Answer Discuss in Forum Workspace Report

20. One coulomb charge is equal to the charge on A.

6.24 x 1018 electrons

3Ω

23. In figure readings of the two voltmeters should be

B. 6.24 x 1024 electrons C. 6.24 x 1018 atoms D. none of the above Answer: Option A Explanation: As per definition 1C = 6.24 x 1018 electrons. View Answer Discuss in Forum Workspace Report 21. For the two port of figure, z22 is

A.

100 V on each meter

B. 200 V on each meter C. 150 V on V1 and 50 V on V2 D. 50 V on V1 and 150 V on V2 Answer: Option B Explanation: Both voltmeter connected in parallel, hence read same voltage as applied.

A.

26/7 Ω

B. 6/7 Ω

View Answer Discuss in Forum Workspace Report

C. 2/3 Ω D. 1 Ω Answer: Option B Explanation:

24. The internal impedance of a source is 3 + j 7 Ω. For maximum power transfer, load impedance should be A.

3+j7Ω

B. 3 - j 7 Ω C. 7 + j 3 Ω D. 7 - j 3 Ω Answer: Option B Explanation: Load impedance should be conjugate of source impedance. View Answer Discuss in Forum Workspace Report

27. Two capacitors of 16 μF each are connected in series. Another capacitor of 16 μF is connected in parallel with this combination. The total capacitance will be A.

48 μF

B. 32 μF 25. In the circuit of figure, the current through battery E3 is C. 24 μF D. Answer: Option C Explanation:

A.

4 A charging

View Answer Discuss in Forum Workspace Report

B. 4 A discharging 28. Assertion (A): Operator has a value 1 ∠ C. 4 A charging or discharging depending on value of E3 - 90° or 1 ∠ 90°. Reason (R): 'a' has a value 1 D. 4 A charging or discharging depending on values of E1, E 2, EOperator 3 ∠ 120°. Answer: Option A Both A and R are true and R is Explanation: A. correct explanation of A 4 A current is flowing into the battery. Therefore, it is charging current. Both A and R are true and R is View Answer Discuss in Forum Workspace Report B. not the correct explanation of A 26. In the circuit of figure C. A is true but R is false D. A is false but R is true Answer: Option D A. Va would always lag Vb Explanation: j = 1∠90°. B. Va would always lead Vb View Answer Discuss in Forum Workspace Va and VReport b would always be C. in phase D. Va may lagand or lead Vb 29. The maximum current voltage ratingsAnswer: for a 0.5 Option W, 10 kW resistor are B Explanation: A. 7.07 mA and 70.7 V Voltage inductance leads B. 70.7 mA across and 70.7 V the current and voltage across

C. 0.707 mA and 70.7 V D. 7.07 mA and 70.7 x 103 V Answer: Option A Explanation:

32. In a series RLC circuit, the current at resonance is I0 the total energy stored in the circuit at resonance is A.

LI02

B. 2 LI02 C. 2 LI02

. View Answer Discuss in Forum Workspace Report

D. 0.5 LI2 Answer: Option A Explanation:

30. Figure shows a pole zero plot of I(s). The likely current response in time domain is View Answer Discuss in Forum Workspace Report

A.

i (t) = e-1 - e-3t

33. If J, I and a denote current density, current and area of cross section of a conductor, then

B. i (t) = e-1 - 2e-2t

A.

J = Ia

C. i (t) = e-1 - e-2t

B. J = I/a2

D. i (t) = e-1 - e-4t

C. J = I/a

Answer: Option B Explanation:

D. J = Ia2

Answer: Option C Explanation: Therefore , i(t) = -e-t + 2e-2t View Answer Discuss in Forum Workspace Report Current density = current/area of crosssection. A system has transfer 31. View Answer Discuss in Forum Workspace function Report dc gain is

The

A. 1 34. In figure, the short circuit current through terminal AB B. will be 2 C. 5 D. 10 Answer: Option C Explanation: DC gain, i.e., gain at s = 0 A.

1.5 Aequals View Answer Discuss in B. 3 A Forum Workspace Report C. 2 A D. 1 A

Answer: Option D Explanation:

B. 10 ∠45° C. 8.062 ∠29.7° D. 8.062 ∠73°

Battery current =

Answer: Option C Explanation: A + B = 7 + j4 = 8.062∠29.7° View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

35. If A = 3 + j1, A4 A.

100 ∠18.43°

B. 100 ∠73.72°

38. When a constant voltage source and constant current source are in series, the current source is ineffective. A.

True

B. False

C. 10 ∠18.43°

Answer: Option B Explanation:

D. 10 ∠73.72°

The voltage source is ineffective.

Answer: Option B Explanation: A = 3 + j1 = 3.162∠18.43°, A4 = 100∠73.72°.

View Answer Discuss in Forum Workspace Report

36. A low pass single pole filter has a phase shift are A.

the corner frequencyis and its 39. Identify which of the following not a tree of the graph shown in figure

1K rad/sec

B. 40 kHz C. 4 kHz D. 40 x 103 rad/sec Answer: Option D Explanation: A.

bcgh

B. defg C. abfg D. aegh Answer: Option C Explanation:

ωc = 0.04 x 106 ωc = 40 k rad/sec. It does not contain all the rodes. View Answer Discuss in Forum Workspace Report View Answer Discuss in Forum Workspace Report 37. If A = 3 + j1 and B = 4 + j3, A + B = A.

7 ∠45°

40. The response of a network is shown in figure. WhichView of following Answerrepresents Discuss inlocation Forum Workspace of Report poles? 41. The network has 10 nodes and 17 branches. The numbe would be A.

7

B. 9 C. 10 D. 45 Answer: Option B Explanation: Node pair voltage = number of node - 1. A.

View Answer Discuss in Forum Workspace Report

42. For the time domain response shown in figure the pole

B.

A.

lies in left half plane

B. lies on imaginary axis C. lies along the positive real axis C.

D. may be complex or imaginary Answer: Option C Explanation: The response is unstable. Therefore pole is on positive real axis. View Answer Discuss in Forum Workspace Report

D.

Answer: Option D Explanation:

43. Two capacitor of 1 F each are connected in parallel. Another 1 F capacitor is connected in series with the parallel combination. The total capacitance is A.

3F

B. 2 F Since response is unbound, poles are in right half plane.

C. View Answer Discuss in Forum Workspace Report

D. Answer: Option C Explanation:

47. For the wave shown in figure, the average and rms values are

View Answer Discuss in Forum Workspace Report

44. The realization of the term Ks yields A.

a resistance of value K ohms

A.

50 A and 57.73 A

B. a capacitances of value K farads

B. 57.73 A and 50 A

C. an inductance of value k farads

C. 25 A and 57.73 A

D. either (b) or (c)

D. 57.73 A and 70.7 A

Answer: Option C Explanation: Impedance of inductance K is sK. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: Area of triangle is half of rectangle. So average value = 0.5 x 100 = 50 A.

45. If operator 'a' = 1 ∠120° then (1 - a2) = A.

1 ∠ - 30°

B. 1 ∠ 30°

View Answer Discuss in Forum Workspace Report

C. 1 ∠ - 60° D. 1 ∠60°

48. A 10 ohm resistance and a 10 ohm capacitor are connected in series across Answer: Option A a 100 V ac supply. The rms voltage Explanation: across resistance is 1 + a2 = - a = 1∠-60°. View Answer Discuss in Forum Workspace Report A. 1002V 46. In figure, a voltmeter of internal resistance 1200 Ω is connected across 600 Ω resistance and it reads 5 V. The value of R is B. 100 V

A.

1200 Ω

B. 2400 Ω C. 3600 Ω D. 7200 Ω Answer: Option B Explanation:

C. D. none of the above Answer: Option C Explanation:

46. In figure, a voltmeter of internal resistance 1200 Ω is con it reads 5 V. The value of R is

View Answer Discuss in Forum Workspace Report

49. When a 10 K, 10%, 1/4 Ω resistor is connected in series with a 12 K, ± 1%, 1/4 Ω resistor, the resulting combination has the following specifications A.

22 K, ± 11%, 1/2 Ω A.

B. 22 K, ± 5.5%, 1/2 Ω

B. 2400 Ω

C. 22 K, ± 5.5%, 1/8 Ω

C. 3600 Ω

D. none of these

D. 7200 Ω

Answer: Option B Explanation: Req = R1 + R 2, imum. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: max View Answer Discuss in Forum Workspace Report

50. The resonance frequency of the circuit is

A.

1200 Ω

47. For the wave shown in figure, the average and rms values are

5.4 Kn2

B. 4.5 Kn2

A.

C. 5 Kn2

B. 57.73 A and 50 A

D. ∞

C. 25 A and 57.73 A

Answer: Option B Explanation: Leq = 2 + 2 + 2

50 A and 57.73 A

D. 57.73 A and 70.7 A Answer: Option A Explanation:

6 mH

Area of triangle is half of rectangle. So average value = 0.5 x 100 = 50 A. . View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

48. A 10 ohm resistance and a 10 ohm capacitor are connected in series across a 100 V ac supply. The rms voltage across resistance is A.

D. ∞ Answer: Option B Explanation:

1002V

Leq = 2 + 2 + 2

6 mH

B. 100 V .

C.

View Answer Discuss in Forum Workspace Report 1. Three identical coils each having self inductance L are co of all the three are in the same direction. If mutual induct M, the total inductance of the arrangement is

D. none of the above Answer: Option C Explanation:

A.

3L+9M

B. 1.5 L + 3 M View Answer Discuss in Forum Workspace Report

C. 3 L + 3 M D. 3 L + 6 M

49. When a 10 K, 10%, 1/4 Ω resistor is connected in series with a 12 K, ± 1%, 1/4 Ω resistor, the resulting combination has the following specifications A.

Answer: Option B Explanation:

Total inductance = L + L + L + M + M + M + M + M + M = View Answer Discuss in Forum Workspace Report

22 K, ± 11%, 1/2 Ω

B. 22 K, ± 5.5%, 1/2 Ω

2. In a resistive ac circuit, the current __________ the voltage by __________ .

C. 22 K, ± 5.5%, 1/8 Ω D. none of these

A.

Answer: Option B Explanation: Req = R1 + R 2, imum. View Answer Discuss in Forum Workspace Report

lags, 90°

B. lags, 45° C. lags, 0° max

50. The resonance frequency of the circuit is

D. leads 90° Answer: Option C Explanation: In a resistive circuit the current is in phase with voltage, i.e., lags by 0°. View Answer Discuss in Forum Workspace Report

3. KVL for second loop in figure is

A.

5.4 Kn2

B. 4.5 Kn2 C. 5 Kn2

D. unit step plus unit ramp

A.

Answer: Option B Explanation:

B.

An impulse has very high rate of rise. Therefore, it cause

C.

View Answer Discuss in Forum Workspace Report 6. Power is drawn from a source at power factor 0.7. Pav = 3 A.

B. 105

D. Answer: Option B Explanation: emf induced in loop 2 due to i1 is View Answer Discuss in Forum Workspace Report

4. When two coupled coils of equal self inductance are cormected in series in one way the net inductance is 12 mH and when they are connected in the other way the net inductance is 4 mH. The maximum value of inductance when they are connected in parallel is A.

0

2 mH

B. 3 mH C. 4 mH D. 6 mH Answer: Option B Explanation:

C. 100 VA D. 107 VA Answer: Option D Explanation: cos θ = 0.7

sin θ = 0.71

Pr = VI sin θ = x 300 x 0.7 107 VA. View Answer Discuss in Forum Workspace Report

7. Two capacitors each of capacitance C and breakdown voltage V are joined in series. The capacitance and breakdown voltage of the combination is A.

0.5 C and 2 V

B. 0.5 C and 0.5 V C. C and V D. 2 C and 2 V Answer: Option A Explanation:

L1 = L2 = L = 4H. When in parallel effective inductance

Since the capacitors are in series, the total capacitance becomes 50%. Voltage across each is V.

= View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

8. The current wave shown in figure is 5. An R-L series circuit is excited by a voltage v(t). The applied circuit was Which of the at t initially = 0 to arelaxed. 0.1 F capacitor. following sources of v(t) would cause maximum current at t = 0+? A.

unit step

B. unit impulse C. unit ramp

At t = 1 s, the voltage across capacitor is

D. may increase or decrease Answer: Option A Explanation:

For mica ∈r is more than that of air. View Answer Discuss in Forum Workspace Report 11. For the two port network of figure, the voltage transfer ra

A.

0V

B. 10 V C. 20 V

A.

D. 40 V Answer: Option C Explanation: Q = 4 x 0.5 = 2C

B.

C.

and View Answer Discuss in Forum Workspace Report

D. Answer: Option B Explanation:

9. A capacitor can be represented by a capacitance C in parallel with a resistance R. For a good capacitor, the resistance R should be A.

very high View Answer Discuss in Forum Workspace Report

B. high C. very low D. low Answer: Option A Explanation:

12. A circuit has two branches 1 and 2 in parallel. If |Q1| = 8 KVAR and |Q2| = 6 KVAR, the magnitude of total kvar drawn form supply will be A.

14 KVAR

Very high R will mean low dielectric loss. View Answer Discuss in Forum Workspace Report

B. 2 KVAR C. zero D. 14 or 2 KVAR

10. If a sheet of a mica is inserted between the plates of Answer: an air capacitor, the capacitance Option D Explanation: A. will increase Both Q1 and Q2 may be positive or negative. B. will return the same View Answer Discuss in Forum Workspace Report C. will decrease

13. The driving point impedance Z1 is given by

View Answer Discuss in Forum Workspace Report

15. A specimen of a material has a resistivity of 1.78 x 108 oh A.

semiconductor

B. conductor C. semiconductor or conductor A. D. insulator Answer: Option D Explanation:

B.

Insulators have high resistivity.

View Answer Discuss in Forum Workspace Report 16. In a purely capacitive circuit, the current __________ the

C.

A. D.

lags, 0°

B. leads, 90°

Answer: Option D Explanation: SCNF is zero of an impedance function. OCNF is pole of an impedance function.

C. lags, 90° D. lags, 45° Answer: Option B Explanation: In inductive circuit current leads the voltage by 90°. View Answer Discuss in Forum Workspace Report

. View Answer Discuss in Forum Workspace Report

14. When a function Z(s) having a pole at infinity is realized, we get A.

a capacitance in series

17. A circuit has two branches in parallel and each branch has only one element. The applied voltage and source current are v = 200 sin (200t + 30°) and i = 50 sin (200t + 50°). If one branch has capacitor, the other branch contains A.

resistance

B. inductance

B. a resistance in series

C. capacitance

C. an inductance in series

D. resistance or capacitance

a resistance or inductance in D. series Answer: Option C Explanation: If we divide numerator by denominator we get term sL. s Therefore the network has inductance in series.

Answer: Option A Explanation: The current is leading the voltage. Therefore, it is an RC circuit. View Answer Discuss in Forum Workspace Report

18. In the circuit shown in figure, Is = 4A, Vs = 4, the voltage V is given by

20. If B = 4 + j3, (B)1/3 = A.

2 ∠30°

B. 2 ∠36.87° C. 1.71 ∠12.3° D. 1.71 ∠30° A.

6V

Answer: Option B Explanation: 4 + j3 = 5∠36.87°

B. 8 V C. 4 V D. 2 V Answer: Option A Explanation: Using superposition theorem, when Is = 0, v1 = 2 volt, when Vs = 0, current is 2A in 2Ω, so voltage Net

2 x 2 = 4 volt. 2 + 4 = 6 volt.

View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 21. A two branch parallel tuned circuit has a coil of resistanc one branch and 10 nF capacitor in the second branch. A resistance is A.

1Ω

B. 10 Ω C. 100 Ω D. more than 100 Ω Answer: Option D Explanation:

19. The average value of wave in figure is Dynamic resistance = View Answer Discuss in Forum Workspace Report

22. If each branch of a Delta circuit has impedance 3 Z then each branch of the equivalent Y circuit has impedance. A. A.

Z/3

90 V B. 3 Z

B. 75 V C. 3/3 Z C. 60 V D. Z/3 D. 50 V Answer: Option B Explanation:

Answer: Option A Explanation: Z Δ = 3 Zy Zy = View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

.

23. In the circuit of figure, Thevenin's resistance is 10 Ω

A.

5 sin (2t + 53.1°)

B. 5 sin (2t - 53.1°) C. 25 sin (2t + 53.1°) D. 25 sin (2t - 53.1°) Answer: Option A Explanation: i(t) = iR(t) + iL(t) + iC(t) A.

25 Ω

B. 10 Ω C. 13.33 Ω .

D. 6 Ω

View Answer Discuss in Forum Workspace Report 26. If operator 'a' = 1 ∠120° then (1 + a2) =

Answer: Option B Explanation:

A.

3

B. 3 ∠30° View Answer Discuss in Forum Workspace Report

C. 3 ∠ - 30° D. 3 ∠60°

24. An RLC series circuit has R = 1 Ω, L = 1 H, C = 1 F. The damping ratio is A.

More than 1

Answer: Option A Explanation: 1 - a2 = 1 + 0.5 + j 0.866 = 3∠30°. View Answer Discuss in Forum Workspace Report

B. 1 27. Two 2 port circuits are connected cascaded. To determine the response, it is more convenient to use

C. 0.5 D. Zero

A.

Answer: Option C Explanation:

O.C. impedance parameters

B. S.C. admittance parameters C. ABCD parameters .

View Answer Discuss in Forum Workspace Report

D. h parameters Answer: Option C Explanation:

ABCD matrix of two-four terminal network is the of individual 25. The circuit shown in the figure, with R = 1/3 Ω, L = 1/4H, C = 3F hasproduct input voltage v(t) = ABCD matrices. sin2t. The resulting current i(t) is View Answer Discuss in Forum Workspace Report

28. In the circuit of figure. The current supplied by battery at t = ∞ is

30. For addition and subtraction operations, phasors A.

must be represented in polar form

B. must be represented in rectangular form C. may be represented in any form A.

0A

D. none of the above

B. 5 A

Answer: Option B Explanation:

C. less than 5 A

Addition and subtraction is not possible in polar form.

D. very large Answer: Option B Explanation: At t = ∞, inductance is short-circuited and capacitor is open circuited. View Answer Discuss in Forum Workspace Report

31. The equivalent unit of joule is A.

newton

B. newton-meter C. newton-metre2 D. none of the above Answer: Option B Explanation:

29. The natural frequency Sn of the given circuit is

Both joule and Newton-metre are units of energy. View Answer Discuss in Forum Workspace Report

A.

-1

32. Two coils are connected in parallel. Their fluxes are adding. If the connections of one of the coils are reversed, the total inductance of the arrangement

B. + 1

A.

C. 1/2

B. may increase or decrease

D. - 2

C. will remain the same

Answer: Option A Explanation:

will decrease

D. will increase Answer: Option A Explanation: Mutual inductance term will become negative.

[When current open and seen from inductance side]

Sn + 1 = 0 Sn = -1. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

33. The graph of a network has 6 branches with 3 tree branches. The minimum number of equations required for solution of network is

A.

2

C. less than 5A

B. 3

D. infinity

C. 4

Answer: Option A Explanation:

D. 5

Current through an inductance cannot change instantane

Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report 36.

Three tree branches mean 3 loops and hence 3 equations. View Answer Discuss in Forum Workspace Report

34. In figure, S is closed at t = 0. At t = t1, I = 1 A and di/dt = 1 A/s. Then the value of L is

A.

1H

B. 2 H C. 3 H

37. Assertion (A): Tie set schedule is used in nodal analysis. Reason (R): Loop currents are fictitious quantities. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

D. 4 H Answer: Option B Explanation: i = 18(1 - e-t/L) = 6 and Hence L = 2H. View Answer Discuss in Forum Workspace Report

C. A is true but R is false D. A is false but R is true Answer: Option D Explanation: Tie set schedule is used in loop analysis.

View Answer Discuss in Forum Workspace Report 35. In the circuit of figure, the switch is closed at t = 0. At t = 0+ the current supplied by battery is 38. When a lead acid cell discharges, the specific gravity of electrolyte increases. A.

True

B. False A.

0A

B. 5 A

Answer: Option B Explanation: During discharging specific gravity decreases.

View Answer Discuss in Forum Workspace Report

C. 3 D. 1/4

39. For a high pass filter, β =  in attenuation band. A.

Answer: Option B Explanation:

True

B. False Answer: Option B Explanation: β = - . View Answer Discuss in Forum Workspace Report

. View Answer Discuss in Forum Workspace Report

40. A minimum function has A.

poles and zeros on imaginary axis of s plane 43.

B. no poles or zeros on imaginary axis of s plane In a one port network . It is excited by a unit step current. The C. only poles but no zeros on imaginary axis of s plane initial and final values of voltage across the network impedance are D. only zeros but no poles on imaginary axis of s plane A. Answer: Option C Explanation: Poles and zeros on imaginary axis lead to reactance function. A minimum function cannot B. have poles and zeros on imaginary axis. 41. The current in an RL series circuit is 1 - e-t amperes. Then C. di/dt is A.

1 - e-t D. 1 and 0

B. - e-t

Answer: Option A Explanation:

C. et D. e-2t Answer: Option C Explanation: = 0 - (-e-t) = e-t. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

42. Given ∞

, and f(t)t →

is

. The value of k is

A.

3/16

B. 16/3

44. In the circuit of figure, the current through battery E2 is

A.

1 A discharging

B. 1 A charging C. 9 A discharging D. 9 A charging Answer: Option B Explanation: 1 A current is flowing into the battery. Therefore, it is charging current. View Answer Discuss in Forum Workspace Report

45. In figure, the current supplied by battery at t = 0.5s is 47. When tracing through a resistance we always get a voltage drop. A.

True

B. False Answer: Option B Explanation: A.

1.1 A

It depends on direction of current. View Answer Discuss in Forum Workspace Report

B. 1.9 A C. 0 D. 1.632 A Answer: Option D Explanation:

48. A copper coil has a resistance of 40 ohm at 20°C. At 100°C the resistance is likely to be A.

44 Ω

Time constant of R-L branch = = 0.5 seconds. Current in 6Ω resistance is 1 A B. 54 Ω and current in R-L branch is 63.2% of final current of 1 A. View Answer Discuss in Forum Workspace Report 46.

C. 84 Ω A source of angular frequency 1 rad sec has a source impedance Answer: Option B D. 104 Ω

Explanation: Temperature coefficient of copper = 0.00393 R100 = 40 (1 + 0.00393 x 80) View Answer Discuss in Forum Workspace Report

54 Ω

Answer: Option A Explanation: Only directions are opposite. View Answer Discuss in Forum Workspace Report

2. In figure, the current through R, after the steady state condition is reached, is 49. Assertion (A): In a parallel circuit with three branches having R, L and C respectively and fed by a step current I, the current through inductance is always zero. Reason (R): The time constant of R-L circuit is L/R.

A.

I

A.

Both A and R are true and R is correct explanation of A

B. 0

B.

Both A and R are true and R is not the correct explanation of A

C.

C. A is true but R is false D. A is false but R is true Answer: Option D Explanation: The current through inductance is zero at t = 0 and equal to I at t = ∞. View Answer Discuss in Forum Workspace Report

D. infinite Answer: Option A Explanation: At t = ∞ capacitor behaves as O.C. View Answer Discuss in Forum Workspace Report

3. A two branch parallel tuned circuit has 100 Ω resistance and 0.1 H inductance in one branch and 10-6 F capacitor in the other. At resonance 50. When a source is delivering maximum power to a load through a network,frequency, the ratio ofthe power dynamic resistance is delivered to the source power A.

may be 50% or less than 50%

A.

10 Ω

B. is 50%

B. 100 Ω

C. may be 50% or more than 50%

C. 1000 Ω

D. may be 50% or more less than 50%

D. 10000 Ω

Answer: Option A Explanation:

Answer: Option C Explanation:

Dynamic The network can be replaced by Thevenin's equivalent circuit. resistance The load gets maximum power from the network but Thevenin's theorem does not guarantee that this will be half of maximum power. = View Answer Discuss in Forum Workspace Report View Answer Discuss in 1. The number of electrons in motion at the instant of positive of a symmetrical ac wave is Forum peak Workspace Report the same as that at the instant of negative peak. A.

True

B. False

4. Special circuits using neon tubes, contact relays and capacitors are used in many

domestic appliances. The role of capacitor in figure is to

A.

reduce power loss

B.

function as resistor when relay is on

C.

delay the operation of the contact relay after switching on

B. 24 W

B. 24 W

C. 16 W

C. 16 W

D. 8 W

D. 8 W

Answer: Option B Explanation:

Answer: O Explanati

Voltage across 4Ω resistance = source voltage = 8V. Power = 8 X 3 = 24 W.

Voltage ac voltage = 8

View Answ Forum Wo 7. In the circuit shown in figure the inductor current and capacitor voltage are given at a time t. At this instant i is __________ A and

is __________ A/sec.

D. open circuit the relay terminals Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

-5 A, 10 V

B. 5 A, 50 V A series R, L, C circuit has R = 2Ω, L = 1H, C C.It is2.5, 25 = 1 μF. connected to an ac variable frequency source of peak voltage 10 V. At D. 0,the ∞ power supplied by the source resonance will be Answer: Option A A. Explanation: 50 Ω

5.

B. 25 Ω C. 12.5 Ω D. 6.25 Ω

.

Answer: ViewOption AnswerBDiscuss in Explanation: Forum Workspace Report

8.

6. In figure, the power associated with 3 A source is

In the Bode plot,inof , the View Answer Discuss phase at w = 15 is Forum Workspace Report In figure, A.the∞power associated with 3 A source is B. 45 C. 40 D. 36.8

A.

36 W

A.

Answer: Option D 36 W Explanation:

Explanation: . ZL 20 x 400 8000 8kΩ. View Answer Discuss in Forum Workspace Report

. View Answer Discuss in Forum Workspace Report

9. The inductance of an air cored coil is 2 H. The number of turns is made 3 times, all other quantities remaining the same. The new value of inductance will be 2 2 A.

12. A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q = 100. If each of R, L and C is doubled from its original value, the new Q of the circuit is A.

25

B. 50 C. 100 D. 200 Answer: Option B Explanation:

B. C. 6 H

, If R, C are

D. 18 H Answer: Option D Explanation: Inductance  N2. View Answer Discuss in Forum Workspace Report

10. j6 = A.

j

B. j2

doubled then View Answer Discuss in Forum Workspace Report

13. Assertion (A): The polynomial s3 + 6s2 + 12s + 8 is Hurwitz. Reason (R): In a Hurwitz polynomial all coefficients are non-negative. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. j3 D. - j

.

C. A is true but R is false Answer: Option B Explanation: D. A is false but R is true j6 = j4 . j2 = j2 because j4 = 1. View Answer Discuss in Forum Workspace Report Answer: Option A 11. A loudspeaker transformer has a turns ratio of 20 : 1.Explanation: The speaker impedance is 20Ω. Primary impedance of transformer is No answer description available for this question. Let us discuss. A. 10 K View Answer Discuss in Forum Workspace Report B. 8 K C. 20 K D. 0.5 K Answer: Option B

14. A dc network has an open circuit voltage of 5 V. When its terminals are short circuited a current of 5 A flows through

the short circuit. If the short circuit is removed and a resistance of 1.5 Ω is connected across its terminals, the current will be A.

17. In figure, i(0-) and v(0-) are zero. The switch is closed at t = 0, i(0+) and (∞) are

1A

B. 2 A C. 2.5 A D. 5 A Answer: Option B Explanation:

A.

3 A and 1.5 A

B. 1.5 A and zero C. 3 A and zero View Answer Discuss in Forum Workspace Report

D. 1.5 A and 3 A

Answer: Option C Explanation: 15. A coil of resistance R and inductance L has a capacitor parallel voltage with it. The At iC= in 0 applied = 3Vsource and current frequency is adjusted to a value equal to resonant frequency. Another is added must be 3A. At i =capacitor ∞ source Cvoltage is in parallel with the above circuit, the source current will zero and current must be zero. View Answer Discuss in A. increase Forum Workspace Report B. decrease C. remain the same D. may increase or decrease Answer: Option B Explanation:

18. Tellegen's theorem is applicable to A.

circuits with passive elements only

B. circuits with linear elements only

The circuit will not in resonance. In parallel resonant circuit the current is minimum at circuits with time invariant resonance. Therefore, current will increase. C. elements only View Answer Discuss in Forum Workspace Report 16. In the circuit of figure the current through 3 Ω resistance atcircuits t = ∞ iswith active or passive, D. linear or nonlinear and time invariant or time varying elements

A.

4A

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. 2.5 A C. 3.1 A D. 0 Answer: Option B Explanation: Since capacitor is open circuited at t = ∞, current 20/8 A. View Answer Discuss in Forum Workspace Report

19. The Laplace transforms of voltage function shown in figure is V(t) = 2e-6t. View Answer Discuss in Forum Workspace Report

22. Discharge breakdown in insulators is due to voids. A.

True

B. False

A.

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. C.

D. Answer: Option C Explanation: The wave can be written as t u(t) (t - a) u (t - a). View Answer Discuss in Forum Workspace Report

23. If a coil has diameter 'd' number of turns 'N' and form factor 'F' then the inductance of coil is proportional to A.

N2dF

B. Nd2F C.

20. Which of the statement is correct? A.

D.

h and g matrices are inverse of each other

Answer: Option B Explanation: No answer description available for this C. for reciprocal networks AD - BC = 1 question. Let us discuss. D. ABCD parameters are used in transistor circuit View Answer Discuss in Forum Workspace Report Answer: Option D Explanation: Transistor circuits are analysed using h parameters. 24. In figure, the switch has been closed View Answer Discuss in Forum Workspace Report position for a long time. At t = 0 the 21. switch is opened. At t = 0+, the current is for t < 0, i(t) = 2u(t) A system function is . The system is aticrest where u(t) is an unit step, V(t) for t > 0 is given by B. z and y matrices are inverse of each other

A.

e-6t

B. 2e+6t C. 2e-6t D. ∞ Answer: Option C Explanation:

A.

I

Only high retentivity will ensure permanent magnetism.

B. 0

View Answer Discuss in Forum Workspace Report

C. infinite 27. Which of the following frequencies has the greatest period?

D. Answer: Option A Explanation: Capacitor behaves as short-circuit at t = 0+. View Answer Discuss in Forum Workspace Report

A.

20 Hz

B. 200 Hz C. 20 kHz D. 200 kHz

Answer: Option A Explanation: 25. For the port shown, the short circuit network functionNo at port 2 is description given by available for this answer question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

s + 1/4

28. A variable resistance R and capacitive reactance XC are fed by an voltage. The current locus is

B. s + 4

A.

C. 4s + 1

B. a semi circle in first quadrant

D. s + 16

C. a straight line in 4th quadrant

Answer: Option D Explanation: If port 2 is short circuited then.

a semi circle in 4th quadrant

D. a straight line first quadrant Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

29. Two wires A and B have the same cross-section area and are made of the same material. RA = 600 Ω and RB = 100 . Ω. The number of times A is longer than View Answer Discuss in Forum Workspace Report B is 26. A material for permanent magnet should have A. 6 A. High retentivity B. 2 B. High permeability C. 4 C. Low hysteresis loss D. 5 D. High hysteresis loss Answer: Option A Answer: Option A Explanation: Explanation:

RA = 600 Ω, RB = 100 Ω, . View Answer Discuss in Forum Workspace Report

D.

Answer: Option A Explanation: i = i0 (1 - e-R/Lt) and VR = VL at a given 30. A dc machine has 6 poles all connected in series. Each timepole t. has 9 H inductance and field current is 2 A. Total inductance and total energy stored are View Answer Discuss in Forum Workspace Report A. 9 H and 18 J B. 18 H and 36 J C. 54 H and 108 J D. 108 H and 216 J

33. In figure, the transmission parameters are A = C = 1, B = 2 and D = 3. Then Zin =

Answer: Option C Explanation: Total L = 6 x 9 = 54 H.

Energy = x 54 x 22 = 108 J. View Answer Discuss in Forum Workspace Report 31. In a series RLC circuit the dB level of currents at half power frequencies as compared to A. 12/13 Ω current at resonance is A.

+3

B. 13/12 Ω

B. - 3

C. 3 Ω

C. 0.5

D. 4 Ω

D. - 0.5 Answer: Option B Explanation:

Answer: Option A Explanation:

At half power frequencies, current is - 3 dB. View Answer Discuss in Forum Workspace Report View Answer Discuss in Forum Workspace Report 32. A series RL circuit is initially relaxed. A step voltage is applied to the circuit. If t is the time constant of the circuit, the voltage across R and L will be same at time t equal to A.

 ln 2

34. A sinusoidal voltage is written as v = Im (R2 + XC2)0.5 sin 314 t. Its peak value and frequency are A.

Im and 50

B. Im (R2 + X2C)0.5 and 50 B.

C. 0.707 Im (R2 + X2C)0.5 and 50 D. 2 Im (R2 + X2C)0.5 and 50

C.

Answer: Option B Explanation: v2 = sin (ωt + 90°)

View Answer Discuss in Forum Workspace Report

The dots indicate that M term in KVL equation will be negative. View Answer Discuss in Forum Workspace Report

35. If A = 10 + j then logeA is A.

14.14 ∠45°

B. 200 ∠45°

38. In figure the rms value is

C. 2.65 + j45° D. 2.65 + j0.785 Answer: Option D Explanation: A = 14.14Ð45°, loge A = loge 14.14 x = 2.65 + j 0.785. A. 5 View Answer Discuss in Forum Workspace Report 36. Which synthesis procedure requires the use of mutualB. inductance? 2.5 A.

Foster's synthesis C. 2.5

B. Cauer synthesis D. 50 C. Bott-Duffin synthesis

Answer: Option D Explanation: D. Brune's synthesis RMS value = 102 x 0.5 = 50. Answer: Option D View Answer Discuss in Explanation: Forum Workspace Report No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

37 KVL equation for the circuit of figure is .

39. A series RL circuit is excited by a voltage v(t) = Vm sin (ωt + Φ). The transient current will be zero if A.

Φ=0

B. ω = 0 C. Φ = tan-1 (ωL/R) D. ω - tan-1 (ωL/R) = /2

A .

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B . C . D . Answer: Option C Explanation:

40. Consider the following from the point of view of possible impedances using passive elements 1. 2.

C. 106A D. 10 μA

3. 4.

Answer: Option A Explanation: Among these A.

1, 2, 4 are realisable

B. 1, 2, 3 are realisable C. 3, 4 are realisable D. none is realisable Answer: Option B Explanation:

View Answer Discuss in Forum Workspace Report

43. In figure, the value of R should be

In realisable functions degrees of numerator and denominator can differ by a maximum of 1. View Answer Discuss in Forum Workspace Report 41. The frequency at which maximum voltage occurs across the inductance in R-L-C series circuit is A.

5 kΩ

B. 50 kΩ

A.

C. 20 kΩ D. 10 kΩ Answer: Option C Explanation:

B.

C. View Answer Discuss in Forum Workspace Report D.

44. A practical Parallel resonant circuit has a coil in Parallel with a 0.14 μf capacitor. The coil has an inductance of 1 mH and a resistance of 10 ohms. The Q of the Answer: Option D circuit is Explanation: No answer description available for this question. Let us A. discuss. 1000 View Answer Discuss in Forum Workspace Report B. 100 42. A series circuit has R = 5 Ω and C = 10 μF. At t = 0 it is switched on to a 10 V dc battery. The maximum current in the circuit is A.

2A

B. 1 A

C. 10 D. 1 Answer: Option C Explanation:

Reason (R): Voltage source can be converted into current source and vice versa.

. View Answer Discuss in Forum Workspace Report

A.

Both A and R are true and R is correct explanation of A

Both A and R are true and R is B. not the correct 45. An AC circuit has two branches in parallel. The current in one branch is 5 explanation A. Then theof A current source C. A is true but R is false A. must be less than 5 A D. A is false but R is true B. must be more than 5 A Answer: Option A Explanation: C. may be equal or more or less than 5 A Thevenin's circuit uses a voltage source and Norton's circuit uses a current source.

D. 5 A

Answer: Option C Explanation: Discuss 5 A current may be (say) 3 + j 4A. The current in the View otherAnswer branch is x ± jy. in The total current Forum Workspace Report is (3 + x) + (4 ± y). This may be 5A or more or less. 46. The electrolyte in a dry cell is completely dry. A.

True

B. False Answer: Option B Explanation:

49. In the network shown in figure, the voltage drops across R2 and R3 are 10 V and 16 V with polarities as shown. The current in R1

The electrolyte is moist. View Answer Discuss in Forum Workspace Report

47. A series RLC circuit has a resonant frequency of 2000 Hz. The maximum voltage across C is likely to occur at a frequency of about A.

1000 Hz

B. 4000 Hz C. 2025 Hz D. 1975 Hz Answer: Option C Explanation: The maximum voltage across inductance occurs at a frequency slightly above the resonant frequency. View Answer Discuss in Forum Workspace Report

48. Assertion (A): Thevenin's theorem and Norton's theorem are dual of each other.

A.

is 9 A and directed towards node 0

B.

is 9 A and directed away from node 0

C.

is 9 A but directed of current cannot be found

D. is impossible to be found Answer: Option B Explanation: Current through R2 = 5 A towards 0. Current through R3 is 4 A away from node. Total incoming current = 13 A. Current going away from 0 and flowing through R1 = 9 A.

View Answer Discuss in Forum Workspace Report

C. 1/y12 D. h12

Answer: Option C 50. A coil has a resistance of 2 Ω and inductance of 0.1 mH. The applied voltages is suddenly Explanation: increased from 10 V to 20 V. After steady state condition have reached, the available current isfor this No answer description A.

2A

B. more than 2 A but less than 4 A

question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 4 A D. more than 4 A

4. The energy dissipated W in a resistance having voltages v and current i is given by

Answer: Option C Explanation: The final steady state current in RL circuit depends only on final voltage (i.e., 20 V) and A. resistance. View Answer Discuss in Forum Workspace Report 1. Which of the following is correct? B. W = vit2 A. Voltages across a capacitance can change instantaneously B. Voltages across a capacitance cannot change instantaneously C. C. Charge across a capacitance is always constant D. Charge across a capacitance can change instantaneously

Answer: Option B D. Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report Answer: Option A Explanation: No answer description available for this question. Let us discuss. 2. The V-i relation for a varistor is View Answer Discuss in A. i = kvn Forum Workspace Report B. v = kin C. i = kv3

5. In figure, the current through 2 Ω resistance is

D. v = ki3 Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. 3. For 2 port reciprocal network, o.c. output voltage divided by input current is equal to A.

B

B. z12

zero

B. -2A C. 2A D. 1A Answer: Option A

Explanation: No answer description available for this No answer description available for this question. Let us question. discuss.Let us discuss. View Answer Discuss in Forum Workspace Report View Answer Discuss in 6. Forum Workspace An RC Report impadence function has a pole at s = 0. The first element in the Foster form of X synthesis 9. A series RC circuit has fixed C, and variable R. The A. current is Rlocus is in the first quadrant. B. may be R and C A. True B. False

C. is C

Answer: OptionD.A is R and C in parallel Explanation: No answer description Answer:available Option Bfor this question. Let us discuss. Explanation: View Answer Discuss in description No answer Forum Workspace Report available for this

question. Let us discuss. View Answer Discuss in Forum Workspace 10. One limitation of constant k filters Report is that Z0 is not constan A. 7. The frequency at which maximum voltage occurs across the capacitance in R-L-C series circuits is given by A.

True

B. False

Answer: Option A Explanation: No answer description available for this question. Let us 11. An m derived and constant k filter section connected in c A.

proper impedance matching

B. proper phase shift characteristic

B.

C. proper attenuation characteristic D. all of the above

C.

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

D. Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

8. μ0 = 8.85 x 10-12F/m. A.

True

B. False Answer: Option A Explanation:

12. At resonance, the parallel circuit constituted by an iron-cored coil and a

capacitor behaves like

View Answer Discuss in Forum Workspace Report

15. In a linear bilateral passive element two port which of the A.

z11 = z22

B. z12 z22 = z11 z22 C. z11 z12 = z22 z21 D. z12 = z21 A.

open circuit

B. short circuit C. pure resistor of value R D.

pure resistor of value much higher than R

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

13. For an RC admittance function Y, the slope dY/dσ A.

is positive

B. is negative C. may be positive or negative D. 0 Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

14. Carbon resistances are used in very high values. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss.

Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 16. During discharging a capacitor through a resistance, volt magnitude. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

17. In an RLC series circuit having finite values of RLC, the phase difference between applied voltage and current is A.

always 0°

B. between 0 and 180° C. between 0 and 90° D. always 90° Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

18. In ZRC (s) = 0 at s =∞, the last element in second Foster realization will be A.

R

B. C C. R and C in series D. R and C in parallel

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

22. The nodal method of circuit analysis is based on A.

KVLs, ohm law

B. KCLs, ohm law 19. Assertion (A): The dual of a circuit can be drawn by window-dot method. Reason (R): The principle of duality is of great help in circuit analysis. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. KCLs, KVL D. KCL, KVL, ohms law Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. A is true but R is false D. A is false but R is true

23. In figure, the current I

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. 20. A short-circuit is that which is A.

used short pieces of wire

B. goes only a short distance

is 2 A from A to B

B. is 2 A from B to A C. depends on the value of R D. none of the above

C. is used for dimming light

Answer: Option A Explanation: D. offer very low resistance path for current to flowNo answer description available for this question. Let us discuss. Answer: Option D View Answer Discuss in Explanation: Workspace Report No answer description available for this question. LetForum us discuss. View Answer Discuss in Forum Workspace Report 21. In the voltage equation v = 500 e-5t sin (2 50t), the frequency is 24. Pico-farad is equal to A. 2 x 50 Hz B. 50 Hz

A.

10-6 farad

B. 10-12 farad C.

C. 10-3 farad

D. (2 x 50 Hz) 5 Hz

D. 10-9 farad

Answer: Option B Answer: Option B Explanation: Explanation: No answer description available for this question. LetNo usanswer discuss.description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

D. 173.2 V

Answer: Option C Explanation: No answer description available for this 25. A network has only independent current sources and resistance. If values of all resistors are question. Let us discuss. doubled, the values of node voltages View Answer Discuss in A. will become half Forum Workspace Report B. will remain unchanged 28. In the figure shown, assume that all the capacitors are initially unchanged and Vi(t)and = 10 U(t) volts then V0are (t) isknown given by D. cannot be determined unless circuit configuration values of resistors C. will become double

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 26. Which of the following is/are correct? The circuit shown in the figure.

A. 1. 2. 3. 4.

8 e-0.004t volts

B. 8 (j - e-0.004t) volts is reciprocal has Z11 = 2, Z22 = 2 C. 8 u(t) volts has Z11 = 4, Z22 = 2 has Z11 = 0, Z22 = 2 D. 8 volts Select the correct answer using the code given below: Answer: Option B A. 1 and 3 Explanation: No answer description available for this B. 1 and 2 question. Let us discuss. View Answer Discuss in C. 1 and 4 Forum Workspace Report D. 3 only Answer: Option A 29. For the network in figure, the correct loop Explanation: for loop 3 is No answer description available for this question. Letequation us discuss. View Answer Discuss in Forum Workspace Report

27. A sine wave of voltage varies from zero to maximum of 200V. How much is the voltage at the instant of 30° of the cycle? A.

50 V

B. 82.8 V C. 100 V

A.

-I1 + 4I2 + 11I3 = 0

B. I1 + 4I2 + 11I3 = 0

C. -I1 - 4I2 + 11I3 = 0

A.

D. I1 - 4I2 + 6I3 = 0

B. will remain unchange

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

30. Force = Electric intensity x current. A.

True

will become half

C. will become one third cannot be determined unless the D. circuit configuration and the values of the resistors are known Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. False Answer: Option B Explanation: 34. Which of the following statements is No answer description available for this question. Letcorrect? us discuss. View Answer Discuss in Forum Workspace Report A. R-C is a dual pair 31. In a R-L-C circuit at resonance is B. LCresonance. is a dual pair A. maximum in series resonance and minimum in parallel Norton is a series circuit B. maximum in parallel resonance and minimum inC. series resonance C. minimum in both series and parallel resonancesD. Thevenin equivalent a parallel circuit D. maximum in both series and parallel resonances. Answer: Option B Answer: Option A Explanation: Explanation: No answer description available for this No answer description available for this question. Letquestion. us discuss. Let us discuss. View Answer Discuss in Forum Workspace Report View Answer Discuss in Forum Workspace Report 32. The zeros of a minimum phase function lie on A.

imaginary axis

35. Which of the following statements is correct? A.

In the magnetic circuit energy is needed continuous

B. left half plane or origin

B. In the magnetic circuit energy is needed continuous

C. left half plane or imaginary axis

C. The flow of current in the electric circuit involves dis

D. right half plane or origin Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D.

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 36. The response to sinusoidal excitation can be found by A.

33. A network contains only independent current source and resistors. If the values of all resistors are doubled, the value of the node voltage

The flow of current in the electric circuit requires en not to maintain it

settings s = jω in the network function

B. settings s = - jω in the network function C. taking inverse transform of network function

D. none of the above

D. A is false but R is true

Answer: Option A Answer: Option B Explanation: Explanation: No answer description available for this question. LetNo usanswer discuss.description available for this View Answer Discuss in Forum Workspace Report question. Let us discuss. View Answer Discuss in Forum Workspace Report 37. The time constant of an R.C. circuit increases if the value of resistance is A.

increased

40. If the ratio p(s)/q(s) represents a transfer function then A.

the degree of p(s) may be as small as zero, indepe

B. decreased B. the degree of p(s) and q(s) must be equal C. either of the above C. the degrees of p(s) and q(s) must not be equal D. none of the above Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. the degrees p(s) and q(s) must differ by at least two

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 41. In the above circuit, if the power dissipated in the 6 Ω res

38. For an RC impedance function A.

all poles lie on jω axis

B. all poles are simple , C.

all poles are simple and lie on negative real axis

A.

20 2∠ 45°

B. 20 ∠ 30° D. none of the above Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

39. Assertion (A): In high Q circuits poles of Y(s) lie close to ω axis in complex frequency plane. Reason (R): Q is inversely proportional to damping factor. A. B.

Both A and R are true and R is correct explanation of A Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

C. 20 ∠ 45° D. 20 2∠ 30° Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

42. If Va1 = Va2 = 100 V and Va0 = 0, then Va, Vb, Vc are A.

200, -100 and -100 V

B. 100, 100, 300 V C. 200, 100, 100 V D. 100, -100, 100 V Answer: Option A Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

45. For an RC driving point impedance function, the poles an A.

should alternate on real axis

B. should alternate only on negative real axis 43. Assertion (A): A series RLC circuit resonates when excited by variable frequency source. Reason (R): Resonant frequency is geometric mean of half power frequencies. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. should alternate on imaginary axis D. none of the above Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 46. In the circuit of figure the current through 5 Ω resistance

C. A is true but R is false D. A is false but R is true Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

4A

B. 2.5 A C. 3.1 A D. 0 A

44. In figure, the switch S is initially open and steady state conditions are reached. At t = 0 switch is closed. The initial current through 2C capacitor is

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

47. In h parameter representation, the independent variables are A.

I1 and V2

B. I2 and V1 C. V1 and V2 A.

zero

B. 1 A C. 2 A D. 3 A Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. I1 and I2 Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

48. For maximum transfer of power, internal resistance of the source should be

A.

equal to load resistance

B. 2, 3

B. less than the load resistance

C. 3, 4

C. greater than the load resistance

D. 1, 4

D. none of the above Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

2. The Q factor of a series RLC circuit is A.

49. Nichrome is used in A.

heater coils

B.

B. underground cables C. overheated wires

C.

D. lamp filament Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

50.

D. Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

The Laplace transform of a continuous-time signal x(t) is If the Fourier transform of this signal exists, then x(t) is 3. A. e2tu(t) - 2e-tu(t) The function B. - e2tu(- t) - 2e-tu(t) A. is a reactance function C. - e2tu(- t) + 2e-tu(t)

B. is an RC function

D. e u(- t) - 2e u(t) 2t

-t

C. is an RL function Answer: Option D may be reactance function or RC Explanation: D. function No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report Answer: Option A 1. Which one is correct statement? Explanation: 1. Circuit is always open 2. Network is always open 3. Circuit is always closed

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

4. Network is always closed A.

1, 2

4. If the network in figure (1), (2) are equivalent at terminals A - B, then voltage

V and resistance R are

B. three phase three wire C. three phase 4 wire D. (a) or (b)

A.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

100V and 12 Ω

B. 60V and 12 Ω C. 100V and 30 Ω D. 60V and 30 Ω Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

8. In ZRC(s) has a pole at s = 0, the first element in second Foster realization is A.

R

B. C C. R and C in series D. R and C in parallel

Answer: A The ratio of power 5. A source is delivering maximum power to a resistance throughOption a network. Explanation: delivered to the source power, No answer description available for this A. is always 0.5 question. Let us discuss. View Answer Discuss in B. may be 0.54 or less Forum Workspace Report C. may be 0.5 or less D. may be 0.5 or more

9. A delta connection contains three impedances of 60 Ω each. The Answer: Option B impedances of equivalent star Explanation: No answer description available for this question. Letconnection us discuss.will be View Answer Discuss in Forum Workspace Report A. 15 Ω 6. The Laplace transform of a function is A.

B. 20 The function is Ω

E sin at

C. 30 Ω

B. Ee-at

D. 40 Ω

Answer: Option B Explanation: D. E cos at No answer description available for this question. Let us discuss. Answer: Option C View Answer Discuss in Explanation: Workspace Report No answer description available for this question. LetForum us discuss. C. 1/(s + a)

View Answer Discuss in Forum Workspace Report

7. The distributors for residential areas are A.

single phase

10. A unit impulse current δ (t - b) is applied to a capacitance is A.

B. C δ (t - b)

B.

critical resistance/actual resistance

C. Cu (t - b) C. critical resistance D.

D. none of the above

Answer: Option A Answer: Option D Explanation: Explanation: No answer description available for this question. LetNo usanswer discuss.description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report View Answer Discuss in 11. The poles of an RC function Forum Workspace Report A. are simple and lie or negative real axis B. are simple and lie on ω axis C. must be complex conjugate

14. In admittance parameter set, the dependent variables are the currents at the two ports.

D. may be anywhere on s plane

A. True Answer: Option A B. False Explanation: No answer description available for this question. LetAnswer: us discuss. Option A View Answer Discuss in Forum Workspace Report Explanation: 12. For circuit in figure, which combination of VTH and RTH represents the circuit as seen from ab?

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

15. A constant k low pass filter has fc = 500 Hz. At f = 1000 H A.

zero

B. infinity C. may be zero or infinity A.

1 V, 10 Ω

B. 1 V, 1000 Ω C. 1 mV, 1000 Ω D. 1 mV, 10 Ω Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. more than zero but less than infinity Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 16. If two network is connected in series-parallel connection A.

h = [ha] + [hb]

B. [aa] + [bb] C. [Z] = [Za] - [Zb] D. none

13. Damping ratio = A.

actual resistance/critical resistance

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

17. For the two ports in figure, y11 = 8 mho, y12 = y21 = -6 mho and y22 = 6 mho. The values of YA, YB, YC respectively are

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

20. For a two port network to be reciprocal A.

2, 6, 6 mho

A.

Z11 = Z22

B. 2, 6, 0 mho

B. y12 = y21

C. 2, 0, 6 mho

C. h21 = - h12

D. 2, 6, 8 mho

D. AD - BC = 0

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 21. Peak to peak value of a sine wave is equal to twice the p A.

True

B. False 18. Vth = 0, if A.

there is no independent source in circuit

B.

there is no dependent source in circuit

voltage source of infinite C. magnitude

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

22. The following circuit resonates at

D. none Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. 19. The electrochemical equivalent of a material A.

0.5 Hz

B. 5 Hz C. 1 rad/sec

depends on its valency D. 0.5 rad/sec

B. depends on its atomic weight C.

depends on its valency and atomic weight

D.

depends on the degree of hardness of the material

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

3. The current through a capacitor is zero if voltage across 23. In an ac network, Thevenin's impedance and Norton's impedance are A.

always the same

4. Voltage across a capacitor cannot change instantaneous current. 5. qc(0-) = qc(0+)

B. generally the same

A.

C. sometimes the same

B. 3, 4, 1, 2

D. always different

C. 2, 4, 3, 1

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

24. In an RC impedance function A. B.

the highest critical frequency is a pole the highest critical frequency is a zero

C.

the highest critical frequency is a pole or zero

D.

the highest critical frequency is a pole at s = 0

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

5, 4, 3, 2

D. 1, 2, 3, 4, 5 Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

27. If a driving point function N(s) = p(s)/q(s), then A.

the terms of lowest degree in p(s) and q(s) may differ in degree by zero only

the terms of lowest degree in p(s) B. and q(s) may differ by one at the most the terms of lowest degree in p(s) C. and q(s) may differ in degree by two at the most the terms of lowest degree in p(s) D. and q(s) may differ in degree by three at the most

Answer: Option D Explanation: No answer description available for this question. Let us discuss. 25. Kirchoff's voltage law is not valid for a non-linear network View Answer Discuss in Forum Workspace Report A. the statement is true B. the statement is false C. can't say D. none of the above

28. For a half wave rectified voltage, the form factor and peak factor respectively are

A. 1.11 and 2 Answer: Option B Explanation: B. 1.57 and 2 No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report C. 1.11 and 1.11 26. Which one is correct option? D. 1.57 and 2 1. A pure capacitor never dissipates energy, but only stores. Answer: Option B 2. Capacitor can store finite amount of energy even cunent is zero. Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

32. The condition AD - BC = 1 for two port network implies that the network is a A.

29. A series LCR circuit consisting of R = 20 Ω, | XL | = 20 Ω and | XC | = 20 Ω, connected across an A.C. supply of 200 V rms. The rms voltage across the capacitor is A.

100 ∠ 45

B. 400 ∠ -90° C. 400 ∠ +90°

reciprocal

B. lumped element network C. lossless network D. unilateral element network Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. 100 ∠ -45 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

33. The units for electrochemical equivalent are A.

grams

B. grams per coulomb C. gram-coulomb

30. Assertion (A): In KVL equations involving mutually coupled circuits sign of M terms can D. grams perthe ampere be positive or negative. Answer: Option D equations. Reason (R): Dot convention helps in determining sign of M terms in KVL Explanation: A. Both A and R are true and R is correct explanation of A description available for this No answer question. Let us discuss. B. Both A and R are true and R is not the correct explanation of A View Answer Discuss in Forum Workspace Report C. A is true but R is false D. A is false but R is true 34. Two coupled coils A and B are Answer: Option C connected in series. The total Explanation: No answer description available for this question. Letinductances us discuss. in series aiding and series opposing connections are LA and LB. View Answer Discuss in Forum Workspace Report The mutual M is positive 31. If F1(s) and F2(s) are two positive real functions, then the functioninductance which is always real is A. A. F1(s) F2(s) B. F1(s) - F2(s)

B.

C. C. D. F1(s)/F2(s) Answer: Option D D. Explanation: No answer description available for this question. LetAnswer: us discuss. Option B View Answer Discuss in Forum Workspace Report Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. The impedance 3.2 - j 12 in polar form is given as 38. In the circuit shown in figure, maximum A. 6.4 ∠ - 75° power will be transferred when B. 8.4 ∠ - 75° C. 10.4 ∠ - 75° D. 12.4 ∠ - 75° Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. ZL = 13 - j 9 36. The differential equation for the current i(t) in the circuit of the figure is B. ZL = 13 + j 9 C. ZL = 9 - j 13 D. ZL = 9 + j 13

A.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B.

C.

39. In the analogy between electric and magnetic circuits, flux is analogous to A.

D.

current

B. voltage

C. rate of charge of current Answer: Option C Explanation: D. rate of charge of voltage No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report Answer: Option A Explanation: No answer description available for this question. Let us discuss. 37. For an R-C impedance function, the View Answer Discuss in residues at all poles are Forum Workspace Report A. real B. imaginary

40. A two port network is reciprocal if and only if

C. real and positive

A.

D. positive

B. BC - AD = - 1

Answer: Option C

Z11 = Z22

C. Y12 = Y21 D. h12 = h21

43.

If then the value Answer: Option B Explanation: of is No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. not determined 41. For the mechanical system of figure, the correct differential equation is (where x = B. zero displacement in m, M = mass in kg, B = damping constant, N - sec/m K is spring constant, N/m and F = force, newton). C. 1 D. ∞ Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. 44. In solids the current flow is due to electrons only. B.

A.

True

B. False C.

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D.

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 45. In a discharging R-L circuit voltage across the resistor ex A. 42. The voltage in a circuit follows the law v = 100 sin ωt if the frequency is 25 Hz, how long will it take for the voltage to rise to 50 volts? A.

1/150 s

B. 1/100 s C. 1/300 s D. 1/600 s Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

a linear rise

B. a linear decay C. an exponential growth function D. an exponential decay function Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 46. Choose the correct option 1. Mesh is the smallest loop of circuit 2. Loop is smallest path of circuit 3. Loop does not contain any mesh 4. Loop may have one or more than one mesh

A.

1, 2, 3, 4

B. 3, 4, 2 C. 1, 4

49. An input circuit has both direct and alternating current flowing through it. It is desired to transfer alternating current only by using one of the coupling units shown in figure. The coupling circuit which will do this job most effectively is

D. 3, 2 Answer: Option C Explanation: A. No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

47. Tesla is unit of A.

B.

Φ

B. B C. H D. MMF

C.

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D.

48. In the given circuit, V1 = 40 V when R is 10 Ω. When R is zero, the value of V2 will be

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

50. In one time constant, the current in a circuit reaches ___ A.

A.

40 V

10

B. 30 V

B. 37

C. 20 V

C. 63

D. 10 V

D. 85

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 1.

Assertion (A): Laplace transform of f(t) = e-at sin ωt is Reason (R): If Laplace transform of f(t) is F(s), then Lapl A.

Both A and R are true and R is correct explanation

4. Inexplanation figure, V1 =of 40AV when R = 10 Ω, if R = B. Both A and R are true and R is not the correct 0, V2 will be C. A is true but R is false D. A is false but R is true Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. 40 V 2. A series RLC circuit is overdamped when A.

B. 30 V C. 20 V D. 10 V Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B.

C. D. R is infinite Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

5. The series element of a band stop filter is A.

capacitive

B. inductive C. parallel combination of L and C D. series combination of L and C

3. The function (s + 2) (s + 4)/[(s + 1)(s + 3)] A.

is a reactance function

B. is an RC function C. D.

may be a reactance function or an RC function may be RC function or an RL function

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 6. In a network containing resistances, reactances the root for the circuit A.

the forced response

B. the total response C. the natural response D. the damped response Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

7. The time constant of the circuit in figure is

D. A is false but R is true Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

RC

10. In the synthesis of RLC network

the number of elements in Bott-Duffin synthesis an equal

B. 2 RC

A.

C. 3 RC

B. the number of elements in Bott-Duffin synthesis is m

D. 5 RC

C. the number of elements in Bott-Duffin synthesis is l

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

8. The circuit whose properties are same in either direction is known as A.

unilateral circuit

B. bilateral circuit C. irreversible circuit

D.

the number of elements in Bott-Duffin synthesis ma Brune's synthesis

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 11. Complex poles give rise to oscillatory terms in the respon A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

D. reversible circuit Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

12. While drawing vector diagram for a series circuit, the reference vector is A.

voltage

B. current C. power

9. Assertion (A): Peak to peak value of a sinusoidal wave is 2.828 times the rms value. Reason (R): Peak factor of a sinusoidal wave is 1.414. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

D. phase angle Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

13. In all insulators the bonding is covalent. A.

True

B. False Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

14. In a purely resistive circuit the instantaneous power varies from zero to maximum twice in each cycle. A.

B.

product of voltage transfer functions of two networks

C. sum of z matrices D. sum of h matrices Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

True

B. False

18. In figure the number of tree branches and links respectively are

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

15. In terms of ABCD parameters, the image parameter Z11 is equal to A.

AC/BD

B. BD/AC

A.

C. AB/CD

B. 1 and 3

D. AD/BC

C. 4 and 1

3 and 2

Answer: Option C D. 1 and 4 Explanation: Option A No answer description available for this question. LetAnswer: us discuss. Explanation: 16. A coil with large distributed capacitance has a No answer description available for this A. high resonant frequency question. Let us discuss. View Answer Discuss in B. low resonant frequency Forum Workspace Report C. low quality factor D. low resistance

19. For a transfer function the coefficients of the numerator and denominator Answer: Option A polynomials in s must be real. Explanation: No answer description available for this question. Let us A. discuss. True View Answer Discuss in Forum Workspace Report B. False 17. The voltage transfer functions of two port circuits connected in cascade can be easily found from A.

product of individual ABCD matrices

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

23. For the wave shown in figure, the average value is 20. A steel bar needs 1200 AT to magnetise it. The voltage that must be applied to the magnetising coil of 100 turns and 10 Ω resistance is __________ volt. A.

120

B. 12 C. 1200 A.

D. 10

0.5 Vm

Answer: Option A B. Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report C. 0.75 Vm 21. In a series resonant circuit, the resonant frequency is D. 0.91 Vm A. geometric mean of half power frequencies Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. arithmetic mean of half power frequencies C. difference of half power frequencies D. none of the above

Answer: Option A Explanation: No answer description available for this question. Let us discuss. 24. A circuit said to be lumped when View Answer Discuss in Forum Workspace Report physical dimensions of all the component are __________ . 22. If a function Z(s) has a pole at infinity, then A.

the degrees of numerator and denominator are equal

B.

the degree of numerator is one higher than that of denominator

C.

the degree of denominator is one higher than that of numerator

A.

greater compared with wavelength of electromagnetic signal

B.

small compared with wavelength electromagnetic signal

negligible compared with C. wavelength of electromagnetic signal D.

the difference between the D. degrees of numerator and denominator is 0 or 1

equal compared with wavelength of electromagnetic signal

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 25.

Assertion (A): Q factor of a series resonant circuit is Reason (R): High Q means better selectivity. A.

Both A and R are true and R is correct explanation

View Answer in B. Both A and R are true and R is not the correct explanation ofDiscuss A Forum Workspace Report C. A is true but R is false D. A is false but R is true

29. When sources of different frequencies feed a network the only method of Answer: Option B solution is superposition theorem. Explanation: No answer description available for this question. Let us A. discuss. True View Answer Discuss in Forum Workspace Report 26. Drift velocity of electrons is generally less than 1 mm/s. B. False A.

True

Answer: Option A Explanation: B. False No answer description available for this question. Let us discuss. Answer: Option A View Answer Discuss in Explanation: Workspace Report No answer description available for this question. LetForum us discuss. View Answer Discuss in Forum Workspace Report 30. In a lead acid battery 27. Which of the following theorems is a manifestation of law of conservation of energy? A.

A.

the numbers of positive and negative plates are eq

B.

the number of positive plates may be equal to or m plates

Tellegen's theorem

B. Reciprocity theorem

C. the number of positive plates is more than the num

C. Thevenin's theorem

D. the number of negative plates is more than the num

D. Norton's theorem Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

28. An ac circuit has two branches in parallel. The impedances of the two branches are equal. The p.f. of one branch is 0.8 lagging and 0.8 leading. The overall p.f. is A.

zero

B. 0.5 lagging C. 1 D. 0.7 lagging Answer: Option D Explanation: No answer description available for this question. Let us discuss.

Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. The capacitance of a cylindrical capacitor is directly prop A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. In a passive band pass filter, the resonant frequencies of series and shunt arms are equal. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

33. Paley Wiener criterion states that a necessary and sufficient condition for an amplitude function |H(jω)| to be causal is

Explanation: No answer description available for this question. Let us 36. When three 100 K, ± 10% fixed resistors of 1/4 W Power resulting 33 K resistor will have a tolerance specification A.

± 10% and 3/4 W respectively

B. ± 10% and 1/12 W respectively that A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. ± 3.3.% and 3/4 W respectively D. ± 30% and 3/4 W respectively Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

37. For the circuit shown in the figure, the initial conditions are zero. Its transfer

34. Which is correct for a transfer function? A.

The poles and zero must be complex

function

is

If the poles and zeros are B. complex or imaginary, they must be conjugate C.

If the poles and zeros are complex they must be simple A.

If a zero is imaginary, it must be D. simple Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B.

C.

D. 35. Choose the correct option, where H(s) is transfer function, Z(s)Option is driving Answer: B point impedance functions Explanation: No answer description available for this question. Let us discuss. A. View Answer Discuss in Forum Workspace Report B.

C.

38. A capacitor with initial charge q0 at t = 0+ acts as A.

D. all Answer: Option D

current source

B. voltage source

C. short-circuit D. open-circuit Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

39. Form factor for a sine wave is A.

1.414

B. 0.707

42. At half power frequencies the current in R-L-C series circuit is __________ times current at resonance A.

1/3

B. 1/4 C. 1/2 D. 1/2 Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1.11 D. 0.637

43. In figure, V reads 45V. Then I =

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

40. Choose the correct option, if b (branch), n (nodes), l (links) A.

b=n+l-1

B. no. of twig = n - 1 C. b = n - l + 1 D. b, a

A.

10.1 A

B. 13.3 A C. 16.1 A

D. 19.4 A Answer: Option D Explanation: Answer: Option A No answer description available for this question. LetExplanation: us discuss. View Answer Discuss in Forum Workspace Report No answer description available for this 41. The resistance of human body is about question. Let us discuss. A.

5000 Ω

B. 2000 Ω C. 1000 Ω D. 200 Ω

View Answer Discuss in Forum Workspace Report

44. A capacitor behave to d.c. as A.

short-circuit

Answer: Option C B. an open-circuit Explanation: No answer description available for this question. Let us discuss. C. it behaves to a.c. View Answer Discuss in Forum Workspace Report D. none of these. Answer: Option B Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

45. For the time domain response shown in figure the pole 48. In a series circuit with fixed R and variable XL, the current locus lies in the fourth quadrant. A.

True

B. False

A.

lies in left half plane

B. lies in right half plane C. lies at origin

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. may be complex or imaginary 49. A parallel connection of circuit is at Answer: Option C below resonance circuit behave as Explanation: A. discuss. RC circuit No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report B. RL 46. A system described by the following differential equation is initially C. RLC rest for input x(t) = 2 u(t), the output y(t) is D. resistive only A. (1 - 2e-t + e-2t) u(t) Answer: Option B B. (1 + 2e-t + 2e-2t) u(t) Explanation: No answer description available for this C. (0.5 + e-t + 1.5e-2t) u(t) question. Let us discuss. View Answer Discuss in D. (0.5 + 2e-t + 2e-2t) u(t) Forum Workspace Report Answer: Option A Explanation: No answer description available for this question.50. Let us discuss. View Answer Discuss in Forum Workspace Report Assertion (A): In figure the coefficients 47. In a minimum function A.

the degree of numerator is higher than that of denominator

B.

the degree of numerator is lower than that of denominator

C.

the degree of numerator and denominator are equal

D. the denominator is a constant

Reason (R): The periodic function is symmetrical about t A.

Both A and R are true and R is correct explanation

4. explanation In a purely inductive ac circuit the power B. Both A and R are true and R is not the correct of A curve is a sinusoid of the same frequency as the voltage. C. A is true but R is false A. True D. A is false but R is true B. False Answer: Option A Explanation: Answer: Option B No answer description available for this question. LetExplanation: us discuss. View Answer Discuss in Forum Workspace Report No answer description available for this 1. When an ac circuit has sources of different frequencies, the only of analysis is question. Letmethod us discuss. superposition theorem. View Answer Discuss in Forum Workspace Report A. True B. False 5. The superposition theorem is applicable to Answer: Option A Explanation: A. linear, non-linear and time variant responses No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report B. linear and non-linear resistors only C. linear responses only 2. In a Parallel connection of circuit the bandwidth in terms of R, L, C is A.

B = 1/RC

B. B = 1/RL C. B = 1/RLC D. B = RLC Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

3. It two voltages are v1 = 100 sin (ωt - 30°) and v2 = cos ω t then A.

v1 is leading v2 by 30°

B. v2 is leading v1 by 30°

D. none of the above

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 6. Which one of the following functions is RC driving point im A.

B.

C.

D. Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

C. v2 is leading v1 by 60° D. v1 is leading v2 by 60° Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

7. The current flowing through a pure capacitor is called displacement current. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss.

View Answer Discuss in Forum Workspace Report

8. For figure, the incidence matrix A is

D. either (a) or (b) Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

10. Which of the following material has nearly zero temperat A.

Carbon

B. Porcelain C. Copper D. Manganin Answer: Option D Explanation: No answer description available for this question. Let us 11. Poor power factor

A.

A.

reduces load handling capability of electrical system

B. results in more power losses in the electrical system

B.

C. overloads alternators, transformers and distribution D. all Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

C.

12. The input resistance of the network in figure is D.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

1.5 R

B.

C. 9. An active network has A.

an e.m.f source

D.

B. a current source C. neither of the above

Answer: Option D Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

13. If two networks are cascaded then A.

A.

[y] = [ya] . [yb]

B. [Z] = [Za] . [Zb] C. [aa] = [bb] D. [aa] + [bb] Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B.

14. When a series RL circuit is switched on to a dc voltage, the rate of change of current is maximum at t = 0. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C.

15. In the set of equation

D. x1 =

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

16. Z-matrix for the network shown in the given figure is 18. The resistance of a bulb at the time of full brightness is 1200 Ω. Then the resistance at room temperature is about A.

1200 Ω

B. 120 Ω C. 600 Ω D. 10 Ω Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

B.

19. For a delayed half wave rectified wave, the average and rms values are lower than those for half wave.

C.

A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D.

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 20. A reactance function is always a quotient of A. 17. In a circuit containing a complex impedance, maximum power transfer takes place when load is A.

pure resistance

B. equal to the complex impedance C.

conjugate complex of the circuit impedance

D. none of the above Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

even to odd polynomials

B. odd to even polynomials C. even to odd or odd to even polynomials D. even to even polynomials

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 21. In a driving point function poles and zeros must be conju A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

22. The storage battery used in power stations and substations is generally A.

C.

nickel cadmium battery D. not possible

B. lead acid battery C. zinc carbon battery D. zinc carbon or lead acid battery Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

25. For an m-derived filter, attenuation is infinite when f = f∞. A.

True

B. False 23. If Δs is an element of area and ΔI is the current through this element, current density J is defined as A.

J = ΔI/Δs

B.

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 26. Laplace transform of tn is A.

C. B. D. none of the above Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

24. The Z parameter of the following Tnetwork is

C.

D. Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

27. RMS value of a square wave is the same as peak value. A.

True

B. False A.

B.

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

28. For graph of figure, one set of fundamental cutsets would be

30. Out of Metal-film type and Carbon-film type, the one with A.

carbon-film

B. metal-film type C. both have same tolerance D. none of these

A.

abc, cde, afe

B. afde, afe, abdc C. cbfe, afe, bdf D. cbd, adbe, cde Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

29. The closing of switch S1 and S2 in figure will light up

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. At very low frequencies a series R-C circuit behaves as a A.

resistive

B. inductive C. capacitive D. none of the above Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. In a composite filter terminating half sections are used for impedance matching. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A.

lamp L1 only

B. lamps L1 and L2

33. The bridge is balanced when the value of R is 50 Ω

C. none of them

A.

D. lamp L2 only

B. 100 Ω

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 200 Ω D. 250 Ω Answer: Option C Explanation: No answer description available for this question. Let us discuss.

View Answer Discuss in Forum Workspace Report

37. In the circuit of figure, the switch is closed at t = 0 with iL (0) = 0 and VC (0) = 0. In the steady state nc equals.

34. In figure, the current through R is 1 A when VA = 0 and VB = 15V. If both VA and VB are increased by 15V each, current through R will be

A.

100 v

B. 0 v C. ∞ A.

1A

B. 0.5 A C. 3 A D. 0.33 A Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. - 100 v Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

38. The maximum power that can be transferred to the load is resistor RL from the voltage source in the figure is

35. When a series RL circuit having power factor angle 0 is switched on to an ac voltage Vm sin (ωt + Φ), the transient term is zero if Φ = 0. A.

True

B. False

A.

1W

B. 10 W Answer: Option A Explanation: C. discuss. 0.25 W No answer description available for this question. Let us 36. A series resonant circuit is capacitive at f = 150 Hz. The circuit will be inductive somewhere D. 0.5 W at Answer: Option C A. f greater than 150 Hz Explanation: No answer description available for this B. f less than 150 Hz question. Let us discuss. Answer Discuss in C. f equal to 150 Hz by increasing the value of theView resistance Forum Workspace Report D. none of the above Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

39. The Thevenin equivalent circuit to the left of AB has Req

42. Consider the following statements regarding driving point admittance function 1. It is an admittance of R1 network 2. Poles and zeros alternate on the negative real axis of plane 3. The lowest critical frequency is a pole

A.

2Ω

B. 4 Ω C. 1 Ω D. 3 Ω Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

4. Y(0) = 1/3 Which of these statements are correct? A.

1, 2 and 3

B. 2 and 4 C. 1 and 3 D. 1, 2, 3 and 4

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 40. A current increasing at the rate of 1A/s is passed through a 1 H inductor. At t = 0, i = 0. The flux linkages after 1 sec are A.

0.5 Wb-turn

B. 1 Wb-turn C. 2 Wb-turn

43. In terms of z parameters, the condition for the network to be passive is A.

z11 = z22

B. z12 = z21

D. 4 Wb-turn

C. z11 = 0 Answer: Option D Explanation: D. z22 = 0 No answer description available for this question. Let us discuss. Answer: Option B View Answer Discuss in Forum Workspace Report Explanation: 41. The capacity of a battery is expressed in terms of No answer description available for this A. current question. Let us discuss. View Answer Discuss in B. voltage Forum Workspace Report C. none of these D. current and voltage

44. Among the filter, Bessel, Butterworth and chebyshev, the filter with maximally flat response is

Answer: Option C Explanation: A. discuss. all No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report B. butterworth C. bessel

D. butterworth, Chebyshev Answer: Option C

Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

47. Assertion (A): A branch with no current through it can be replaced by an open circuit or short circuit. Reason (R): Reciprocity theorem is applicable only if the circuit has one source.

Both A and R are true and R is A. 45. If a two port network is represented by an equivalent T network the admittanceofofAseries arm correct explanation in term of ABCD parameter is equal to Both A and R are true and R is B. A. C not the correct explanation of A B. 1/C

C. A is true but R is false

C. (A - 1)/B

D. A is false but R is true

D. 1/B

Answer: Option B Explanation: Answer: Option D No answer description available for this Explanation: Let us discuss. No answer description available for this question. Letquestion. us discuss. View Answer Discuss in View Answer Discuss in Forum Workspace Report Forum Workspace Report 46. 48. Three capacitors each 9 μF are The RLC circuit for driving point admittance function connected in delta. is The value of each capacitor in equivalent star connection is A.

A.

3 μF

B. 6 μF C. 27 μF D. 81 μF Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B.

C. 49. The function A. D.

is

RC function

B. LC function

C. RL function Answer: Option C D. RC or RL function Explanation: No answer description available for this question. LetAnswer: us discuss. Option B View Answer Discuss in Forum Workspace Report Explanation: No answer description available for this question. Let us discuss.

View Answer Discuss in Forum Workspace Report

A.

True

B. False Answer: Option A 50. The electrolyte in nickel cadmium cell is dilute potassium hydroxide. Explanation: A.

True

B. False

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 4. In figure, the ratio V24/V23 is 1. The two port networks are connected in cascade, the combination is to be represented as a single two-Port network. The parameters of the network are obtained by multiplying the individual matrix A.

z-parameter

B. h-parameter C. y-parameter

A.

D. ABCD parameter Answer: Option D B. Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report C.

2. Which one of the following statements is not a property of RL driving point impedance? A.

The first critical frequency at the origin is a zero

B.

The last critical frequency is a pole

The impedance at S = ∞ always C. less than the impedance at S = zero D.

The slope of the impedance curve is positive at all points

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

5. The pass band of a constant k filter with Z1 and Z2 as ser given by A.

B.

C.

D. 3. In using mesh current method it is necessary that at least one mesh current links every element.

Answer: Option A Explanation: No answer description available for this question. Let us

View Answer Discuss in Forum Workspace Report D. always exist 6. Which one is correct option, if initial conditions is not zero, for inductor (L) and capacitor (c) Answer: Option A is Explanation: No answer description available for this question. Let us discuss. 1. View Answer Discuss in Forum Workspace Report 2. 9. The current density J at a point and 3. current I are related as A.

True

4. A.

1, 3

B. 3, 2 C. 4, 1 D. 2, 4

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option D Explanation: No answer description available for this question.10. LetFor us a discuss. reactance function H(s), the slope dH (jω)/dω is View Answer Discuss in Forum Workspace Report A. 0 7. An RC impedance function has a constant value at s = 0. The last element in the first cauer synthesis A.

will be a capacitor

B. may be R or C C. will be R D.

will depend on the behaviour of function at s = ∞

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

8. Two port Z parameter not exist for the circuit if A.

B. always positive C. always negative D. either 0 or positive

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 11. If the time is counted from the instant when an ac wave i A.

sine wave

B. cosine wave C. distorted sine wave D. none of the above Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

Δz = 0

B. Δz C. Δz = 1

12. For an ac circuit having capacitance C, instantaneous current i and

instantaneous voltage e are related

C. L1 + L2 - 2M

as

D. L1 + L2 + M

A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

13. The relative permeability of an iron specimen is 400 when B = 0.2 T. If B = 0.4 T, μr will be A.

400

B. less than 400 C. more than 400 D. more or less than 400 Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

14. When a circuit is excited by ac sinusoidal source, the admittance is obtained by letting s = jω in Y(s). A.

True

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 16. I = dq/dt. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

17. A resistance of 5 ohms is connected in one branch of a network. The current in this branch is 2.2. A. If the resistance is increased to 7.5 Ω, the remaining circuit being the same, the current in this branch will be A.

2.2 A

B. less than 2.2 A C. 2.2 A or less than 2.2 A D. 2.2 A or less or more than 2.2 A Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

18. A constant k high pass filter has fc = 3000 Hz. At f = 1000 Hz, the phase shift is A.

zero

B.  C. 2 

15. In figure the total inductance of the circuit is

A.

L1 + L2

B. L1 + L2 - M

D. more than  Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A. 19. For an RC impedance function Z A.

Z(∞) = Z(0)

B.

B. Z(∞) < Z(0) C. Z(∞) ≤ Z(0) D. Z(∞) > Z(0) Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 0.5 e-2t D. 0.5 e2t Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

23. In drawing phasor diagram 20. In figure, the effective capacitance between A and B is A. rms values are used B. peak values are used

A.

2 μF

B. 4 μF C. 8 μF D. 10 μF

C.

either rms or peak values are used

D.

either rms or peak or averages values are used

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: No answer description available for this question.24. LetAs usthe discuss. number SWG increases, area of View Answer Discuss in Forum Workspace Report cross-section decreases. 21. If Va1, Va2, Va0 are the symmetrical components of Va, then A. True A. Va = Va1 + Va2 + Va0 B. False B. Va = a2Va1 + aVa2 + Va0 Answer: Option A 2 Explanation: C. Va = aVa1 + a Va2 + Va0 No answer description available for this D. Va = aVa0 + a2Va1 + Va2 question. Let us discuss. View Answer Discuss in Answer: Option B Forum Workspace Report Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 25. In ZRC (s) has a pole at s = ∞, the last element in first Fos A.

R

22. In

B. C C. R and C in series

D. R and C in parallel Answer: Option A Explanation: A. No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 26. The transient currents are due to A.

resistance of the circuit

B. impedance of the circuit

B.

C. voltage applied to the circuit D. changes in stored energy in inductors and capacitors Answer: Option D Explanation: No answer description available for this question. Let us C. discuss. View Answer Discuss in Forum Workspace Report

27. When a lead acid cell is in fully charged condition the specific gravity of electrolyte is about 1.22. A.

D.

True

B. False Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

28. In ZRC(s) has a pole at s = 0, the first element in first Foster realization is A.

a capacitor

B. a resistor

30. An impedance function has term A.

. The realiza

an inductance of value 2K2/ω22

B. a capacitance of value 2K2/ω22

C. R-C in series C. D. either a capacitor or resistor Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

in par

D. none of the above Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

29. A Two port network has V1 = 24 I1 + 8 I2 and V2 = 8 I1 + 32 I2 which of the following networks is represented by above equation?

an inductance 2K2/ω22 and capacitance

e-as/s2

B. a/(s + a) C. 1/(s + a)

D. e-as/s

D. | IL + IC | > 1 mA

Answer: Option A Answer: Option B Explanation: Explanation: No answer description available for this question. LetNo usanswer discuss. description available for this View Answer Discuss in Forum Workspace Report question. Let us discuss. View Answer Discuss in Forum Workspace Report 32. For the network in figure, which of the following expressions gives the value of net inductance between terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

1 only

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL D. none

33. The parallel RLC circuit shown in figure is in resonance. If

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us

View Answer Discuss in Forum Workspace Report No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 32. For the network in figure, which of the following expressions gives the value of net inductance between terminals A and B 34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation:

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

1 only

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL D. none

33. The parallel RLC circuit shown in figure is in resonance. If

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) C. 1/(s + a) A.

IR < 1 mA D. e-as/s

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. If f(t) = r (t - a), F(s) = A.

e-as/s2

B. a/(s + a) A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1/(s + a) D. e-as/s Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For the network in figure, which of the following expressions gives the value of net inductance between

terminals A and B

34. An ideal voltage source can not be converted into an equivalent current source. A.

True

B. False

1. 2. 3. 4.

L1 ± L2 L1 ± L2 ± M L1 ± L2 - 2M L1 ± L2 ± 2M Select the answer using the following codes A.

1 only

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. Load ZL for maximum power transfer is

B. 1 and 2 C. 3 and 4 D. 2 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

R

B. R + jωL C. R - jωL

33. The parallel RLC circuit shown in figure is in resonance. If

D. none Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 36. Eddy current loss is proportional to A.

f and B2m

B. f2 and B2m A.

IR < 1 mA

B. | IR + IL | > 1 mA C. | IR + IL | < 1 mA D. | IL + IC | > 1 mA Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. f2 and Bm D. f and Bm Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

37. Which is correct for a driving point function? A.

If the real part of a pole or zero is zero, that pole must be simple

If the real part of a pole or zero is B. zero, that pole or zero must be simple C.

If the real part of a zero is zero, that pole or zero must be simple

D.

If the real part of a zero is zero that zero must be simple

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

38. In the circuit, the value of the voltage source E is

A.

-22 V

B. -12 V C. +12 V D. -10 V Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

40. For the circuit of figure

A.

B.

C.

D. Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 41. The sum of positive real function is positive real. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

42. Assertion (A): KCL is dual of KVL. Reason (R): Node is dual of mesh. 39. The r.m.s. value of a half-wave rectified current is 100 A. Its value for full-wave rectification would be __________ amperes. A.

141.4

B. 200 C. 200/ D. 40/ Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false D. A is false but R is true Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

43. For a 2 port network, the O/P short circuit current was measured with a 1

volt source at the I/P then value of the current gives A.

h12

B. y12 C. h21 D. y21 Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

44. The time constant of the capacitance circuit is defined as the time during which voltage A.

falls to 36.8% of its final steady value

B.

rises to 38.6% of its final steady value

C.

rises to 63.2% of its final steady value.

D. none of the above. Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. zinc oxide D. rubber Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 46. How much r.m.s. current does a 300 W, 200 V bulb take A.

0.5 A

B. 1.5 A C. 2 A D. 3 A Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

47. In a series R-L-C circuit, the voltage across inductance will be maximum A.

at resonance frequency

B. just before resonant frequency C. just after resonant frequency D. none of the above Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

45. Figure shows the V-i characteristics of a material. The material is likely to be 48. In the circuit shown in the given figure, power dissipated in the 5 Ω resistor is

A. A.

copper

B. carbon

zero

B. 80 W C. 125 W

D. 405 W Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

49. Consider the network graph shown in the figure which one of the following is NOT a 'tree' of graph

B. Both A and R are true and R is not the correct expl C. A is true but R is false D. A is false but R is true

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 1. Fourier transform and F(jω) of a signal f(t) has the prope A.

F(jω) = F(-jω)

B. F(jω) = -F(-jω) C. F(jω) = F*(jω) D. F(jω) = -F*(-jω) Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

A. 2. If f(t) = δ(t), F(s) = A. B.

B. C. 1 D. s Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C.

D. 3. In figure, the current I is Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. 1 A 50. Assertion (A): A parallel resonant circuit is also called anti-resonant circuit. Reason (R): In a parallel resonant circuit impedanceB.is maximum at resonance. 2A A.

Both A and R are true and R is correct explanation of A C. 4 A

D. 8 A Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

4. Figure shows the variation of Z(ω) for a positive real function. The function is

C. P = 0 D. P = ∞ Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

7. When a current flows through a coil of insulated wire, the coil shows the properties of a magnet. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A.

RC impedance

B. RL impedance

8. Transformer coil is an insulator.

C. RLC impedance

A.

D. Reactance function

B. False

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

True

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

9. Assertion (A): An impulse has very 5. The voltage drop per ampere-metre of an aluminium conductor is higher as compared to a copper conductor of the same size due to its higher high magnitude but very small duration. Reason (R): A pulse function is always A. insulation resistance rectangular. B. resistivity

A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. conductivity D. current density

Answer: Option B C. A is true but R is false Explanation: No answer description available for this question. Let us discuss. D. A is false but R is true View Answer Discuss in Forum Workspace Report Answer: Option C. 6. A n-port network is said to be active if power in the ckt is __________ Explanation: A. P > 0 No answer description available for this question. Let us discuss. B. P < 0

View Answer Discuss in Forum Workspace Report

13. For the time domain response shown in figure the pole

10. The active elements on the positive and negative plates of lead acid battery are: A.

lead peroxide and lead

B. lead and lead peroxide C. lead peroxide and lead sulphate A.

lies on negative real axis

D. lead and lead B. lies on positive real axis Answer: Option A Explanation: C. lies on imaginary axis No answer description available for this question. Let us discuss. 11. Millman's theorem is the best to find D. is complex or imaginary A. equivalent voltage or current source Answer: Option A Explanation: B. equivalent voltage source No answer description available for this question. Let us discuss. C. equivalent voltage and resistance of a circuit View Answer Discuss in Forum Workspace Report D. none of the above Answer: Option A Explanation: units of resistivity are ohm-metre. No answer description available for this question.14. LetThe us discuss. View Answer Discuss in Forum Workspace Report A. True B. False 12. The transfer function A.

is for

low pass filter

B. notch filter

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. high pass filter D. band pass filter Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

15. In a series RLC circuit, the resonant frequency is ω0 the defined as A.

B.

C.

D. Answer: Option C Explanation: No answer description available for this question. Let us

View Answer Discuss in Forum Workspace Report 19. The transfer function V2/V1 for figure has 16. A cut set schedule shows A.

incidence of branches to loops

B. incidence of branches to nodes C. incidence of nodes to loops D. none of the above Answer: Option B Explanation: A. a zero at origin No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report B. a zero at infinity C. no zero 17. The value of current at resonance in series R-L-C circuit is affected by the value of A.

C

B. L C. R

D. a zero at j1 Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. all of the above Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

20. A dependent source A.

may be a current source or voltage source

B. is neither a current source nor a voltage source C. is always a voltage source D. is always a current source

18. Sometimes the rotating devices in a room having fluorescent lamps appear to be any station. This is due to A.

defect in the lamp

Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 21. The resonant frequency of a series resonant circuit is

B. low voltage

A.

C. high voltage

B. independent of inductance of the circuit

D. stroboscopic effect

C. independent of capacitance of the circuit

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

arithmetic mean of half power frequencies

D. geometric mean of half power frequencies Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

22. Twelve resistance each 2 ohm are connected to form a cube, one resistance being in each arm of cube.

The resistance between any two diagonally opposite comers is A.

A.

1Ω B.

B. 2 Ω C. 4 Ω

C.

D. 8 Ω Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

23. Choose the correct option ( A.

Tree

B. Twig C. Cutset

D.

Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 26. A series RL circuit is switched on to an exponential sourc

dual).

cotree Link Loop

D. all Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

current A.

True

B. False Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

27. A tie set schedule shows A.

incidence of branches to nodes

B. incidence of branches to loops 24. The voltage induced in a loop of wire rotating in a strong and steady magnetic field is A.

pulsating dc

B. dc C. rectified ac D. ac Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. incidence of nodes to loops D. none of the above Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

28. A constant k band stop filter has cutoff frequencies of 1000 and 4000 Hz. The attenuation will be maximum when frequency is A.

4000 Hz

B. 3000 Hz inductance L, in one 25. A two branch parallel resonant circuit has a coil of resistance R and branch and a capacitors C in the other branch. The source voltage is V, At resonance the C. 2000 Hz circulating current is

D. 1000 Hz Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

29. The

equation where v1, v2 ... vb are the instantaneous branch voltages and i1, i2 ... ib are the instantaneous branch currents pertains to A.

32. A zinc carbon cell is a primary cell. A.

True

B. False Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

33. For the star network of figure, the equivalent delta network is

Compensation theorem

B. Bisectional theorem C. Tellegen's theorem D. Reciprocity theorem Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

30. Transient current in an RLC circuit is oscillatory when A. B. R = 0 B.

C. D.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 31. In a purely inductive ac circuit, the supply voltage andC. voltage induced across inductance are equal and opposite at all instants. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

37. Which of the following is not a non-linear element?

D.

A.

Transistor

B. Heater coil Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

34. In f(t) = δ(t - T), F(s) = A.

C. Diode D. Electric arc with unlike electrodes Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

1 38. Nodal analysis is applicable to __________ .

B. C. e-Ts

A.

planar network

B. planar and Non-planar both

D. Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C.

circuit containing only voltage source

D. non planer

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in 35. When determining Thevenin's resistance of a circuit Forum Workspace Report A.

all sources must be open circuited

B. all sources must be short circuited

39. The transfer

all voltages sources must be open circuited and all current sources must be short function represen circuited ts D. all sources must be replaced by their internal resistances A. a high pass filter C.

Answer: Option B B. band elimination filter Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report C. a resonator 36. When cells are connected in series, emfs of all cells must be equal. D. an all pass filter A. True Answer: Option A Explanation: B. False No answer description available for this Answer: Option B question. Let us discuss. Explanation: View Answer Discuss in No answer description available for this question. LetForum us discuss. Workspace Report View Answer Discuss in Forum Workspace Report

40. For a series circuit of variable R and XL, the impedance 44. The locus reading is of the voltmeter V in figure should be __________ volt. A. a straight line parallel to X axis in first quadrant B. a straight line parallel to X axis in fourth quadrant C. a straight line parallel to Y axis in second quadrant D. a straight line parallel to Y axis in first quadrant Answer: Option A Explanation: No answer description available for this question. LetA. us discuss. 60 View Answer Discuss in Forum Workspace Report B.maximum 10 41. For a given line voltage, four heating coils will produce heat when connected A.

all in parallel

C. 66

B. all in series

D. 0

Answer: Option B Explanation: D. one pair in parallel with the other two in series No answer description available for this question. Let us discuss. Answer: Option A View Answer Discuss in Explanation: Forum Workspace Report No answer description available for this question. Let us discuss. C. with two parallel pairs in series

View Answer Discuss in Forum Workspace Report 45. Two network said to be dual to each other 42. The integral of a unit step function is A.

an impulse function

B. a ramp function C. a ramp function of slope 1 D. none of these Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

if mesh equation of one is same to other of node eq

B. if mesh equation of both is same C. if node equation of both is same D. neither mesh equation nor node equation is same Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 46. For a symmetrical network A.

z11 = z22

B. z12 = z21 43. As per Euler's identity ejωt = cos ωt + j sin ωt A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. z11 z22 and z12 = z21 D. z11 z12 - z122 = 0 Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

47. Consider the following statements

1. Tellegen's theorem is applicable to any lumped network. 2. Reciprocity theorem is applicable to linear bilateral network. 3. Thevenin theorem is applicable to two terminal linear active network. 4. Norton's theorem is applicable to linear active network. Which of the above statements are correct? A.

1, 2 and 3

B. 1, 2, 3 and 4 C. 1, 2 and 4 D. 3 and 4 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

48. A network is causal if impulse response is zero for t < 0. A.

True

View Answer Discuss in Forum Workspace Report

50. Volume control found on the front panel of television rece A.

a ganged resistor

B. a variable resistor of logarithmic type C. a variable resistor of linear type D. a trimmer potentiometer Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 1. Substitution theorem applies to A.

Linear network

B. Non linear network C. Linear time invariant network D. Any network Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

2. In figure, i = Im sin ωt. If v = 0, ω =

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

49. When an alternating current passes through an ohmic resistance the electrical power converted into heat is A.

apparent power

A.

B.

B. true power C. C. reactive power D. none of the above Answer: Option B Explanation: No answer description available for this question. Let us discuss.

D. Answer: Option A Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

tree does not contain any loop

B. tree contain all the nodes C. tree is always open

3. An R-L circuit has an initial current of 5 A. In the s-domain equivalent circuit, the voltage source to take into account the initial current has a strength of A.

5L volts

D. all Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

B. 5/L volts C. 5L2 volts

7. The y parameters of a four terminal

D. 5/L2 volts Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

network are . A one ohm resistance is connected as shown in figure. The new y parameters are

4. A function f(t) = k is A.

stable

B. marginal stable C. unstable D. none Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

5. Transient current in a loss free LC circuit when excited from an ac source is an __________ B. sine wave. A.

undamped

B. over damped C. under damped

C.

D. critically damped Answer: Option C Explanation: D. No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 6. Choose the correct option Answer: Option A

Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

8. What would be the rms value of a sine wave having the same peak value as that of the above mentioned periodic wave? A.

B. lagging, Leading C. independent of frequency D. same Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 11.

42.2 V

B. 19 V C. 38.2 V D. none Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

9. Which of the following is true for RC impedance? A.

The lowest critical frequency is a pole

B.

The lowest critical frequency is zero

C. D.

The lowest critical frequency may be pole or zero The lowest critical frequency is a pole but cannot be at s = 0

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

12. In a 5.6 ohms, ± 10% carbon composition resistor, the colour of the third strip from extreme left is A.

golden

B. silver C. green D. black Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

13. Assertion (A): Most of magnetic circuits have an air gap. Reason (R): An air gap has high reluctance. 10. In a series RLC circuit for lower frequency power factor is __________ . Both A and R are true and R is A. correct explanation of A B. A.

leading, Lagging

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

D. A is false but R is true Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

14. The total lumens emitted by a source of 1 candle are A.

0.4 

B. 4  C. 2 

A.

apparent power is equal to the actual power

B.

reactive power is more than the apparent power

C.

reactive power is more than the actual power

D.

actual power is more than its reactive power

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. 8  Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

18. In ac circuits maximum power is delivered to a load if load impedance is conjugate of source impedance. A.

True

B. False

Answer: Option A Explanation: 15. In an electrochemical process the mass of material deposited atdescription an electrode is proportional No answer available for this to question. Let us discuss. View Answer Discuss in A. time for which current is passed Forum Workspace Report B. magnitude of current C. electric charge through the electrolyte D. none of the above

19. In a series R-L-C circuit at the resonant frequency the

A. current is maximum Answer: Option C Explanation: B. current is minimum No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report C. impedance is maximum 16. The opposition of an inductor to current flow D. voltage is maximum A. depends only on the resistance of the coil Answer: Option A B. depends on the magnitude of the applied voltage Explanation: No answer description available for this C. varies directly with frequency question. Let us discuss. View Answer Discuss in D. varies inversely with frequency Forum Workspace Report Answer: Option C Explanation: No answer description available for this question. Let us discuss. 20. View Answer Discuss in Forum Workspace Report The transfer function H(s) of a system is given by understeady state conditions, the sinusoidal I/P and 0/P 2t and y(t) = cos (2t + Φ), then the angle Φ will be 17. In a highly capacitive circuit the

A.

45°

B. 0° C. -45°

22. If Fourier transform of f(t) is F(jω), then which pairs of time functions and Fourier transforms are matched 1. f (t + 2) - ej2ω F(jω) 2. f (-0.5t) - 2F (-2jω)

D. -90° Answer: Option C 3. Explanation: Select the answer using the following No answer description available for this question. Let us discuss. codes 21. Which of the following is an I.S.I. symbol of cut-out power? A. 1 and 2 B. 1 and 3 A.

C. 2 and 3 D. 1, 2 and 3 Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. 23. In a power system, reactive power is necessary for A.

power transmission

B. stabilising the voltage level

C.

counteracting the effect of C. reactance in the transmission system D. none of the above

D.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

24. A unit impulse voltage δ (t - b) is applied to an inductor with inductance L. The current through L is

Answer: Option D Explanation: No answer description available for this question. Let us A. discuss. View Answer Discuss in Forum Workspace Report B.

C. δ (t - b)

View Answer Discuss in Forum Workspace Report

D. Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

28. In figure, the tree branches are bdf. The fundamental loops include

25. A periodic voltage has following values for equal time intervals changing suddenly from one value to next, 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. then rms value of the waveform is A.

31 volt

B. 32 volt C. insufficient data

A.

D. none

B. cea, bdea, abc

abc, def, bdea

Answer: Option A C. cdb, def, bfa Explanation: No answer description available for this question. Let us discuss. D. abde, def, cdb View Answer Discuss in Forum Workspace Report Answer: Option C 26. The impedance of a coil above self-resonant frequency is Explanation: A. inductive No answer description available for this question. Let us discuss. B. capacitive View Answer Discuss in Forum Workspace Report C. resistive D. none 29. A function Z(s) has zero at infinity if Answer: Option D Explanation: the degree of numerator and A. discuss. No answer description available for this question. Let us denominator are equal View Answer Discuss in Forum Workspace Report the numerator of Z(s) is one B. degree higher than denominator 27. Wire-wound resistors are unsuitable for the denominator of Z(s) is one use at high frequencies because they C. degree higher than numerator are likely to melt under excessive A. the degree of numerator and eddy current heat D. denominator are either equal or exhibit unwanted inductive and differ by one B. capacitive effects Answer: Option C Explanation: C. create more electrical noise No answer description available for this question. Let us discuss. D. consume more power View Answer Discuss in Answer: Option B Forum Workspace Report Explanation: No answer description available for this question. Let us discuss.

30. If f1 and f2 and half-power frequency and f0 be resonant frequency, the point selectivity of R-L-C low melting and low specific A. series circuit is given by resistance A.

(f2 - f1)/2f0

B. (f2 - f1)/f0 C. (f2 - f0)/(f1 - f0)

B.

low melting point and high specific resistance

C.

high melting point and low specific resistance

D. (f2 - f1)/(f1 - f0) D. none Answer: Option B Explanation: Answer: Option B No answer description available for this question. LetExplanation: us discuss. View Answer Discuss in Forum Workspace Report No answer description available for this 31. Assertion (A): When capacitor is fed by a dc voltagequestion. given a capacitor Let us discuss. behaves as short circuit at t = 0 and open circuit at f = ∞. View Answer Discuss in Forum Workspace Report Reason (R): The impedance of a capacitor is A.

Both A and R are true and R is correct explanation of A 34. The function δ (t - b) is a B. Both A and R are true and R is not the correct explanation of A A. unit impulse C. A is true but R is false

B. unit step

D. A is false but R is true

C. unit doublet

Answer: Option A D. none of the above Explanation: No answer description available for this question. LetAnswer: us discuss. Option C View Answer Discuss in Forum Workspace Report Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in 32. 1. P(s) = s4 + s3 + 2s2 + 4s + 3 Forum Workspace Report 2. Q(s) = s4 + 2s3 + s Which one of the following statements in correct for above P(s) and Q(s) polynomials? 35. The circuit in figure is A. Both P(s) and Q(s) are Hurwitz B.

Both P(s) and Q(s) are nonHurwitz

C.

P(s) is Hurwitz but Q(s) is nonHurwitz

D.

P(s) is non-Hurwitz but Q(s) is Hurwitz

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

33. The material used for fuse must have

A.

Cauer I form

B. Foster I form C. Cauer II form D. Foster II form Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

36. In ionic bonding, the valence electron is donated by one atom and In ionic bonding, the accepted by the other atom. valence electron is 39. Maximum power from aby source having donated one atom and A. True internal resistance R is delivered to a i accepted by the other resistive load Ratom. L, if B. False A. Ri > RL A. True Answer: Option A Explanation: B. Ri < RL B. False No answer description available for this question. Let us discuss. C. Ri = RL2 Answer: Option A Explanation: D. Ri = RL No answer description available for this Answer: Option D question. Let us discuss. Explanation: View Answer Discuss in No answer description available for this Forum Workspace Report question. Let us discuss. View Answer Discuss in Forum Workspace Report 37. If Ia, Ib, Ic are line currents and Ia2 is the negative sequences component of Ia then 40. Terra-watt is equal to A. Ia2 = Ia + Ib + Ic A. 103 W B. 106 W

B.

C. 109 W C.

D. 1012 W

D. Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 41. A capacitor does not allow sudden changes A.

in currents

B. in voltage C. in both current and voltage

38. For stable network, the real part of poles and zeros of driving point function must be A.

negative

D. neither of two Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

B. negative or zero C. zero D. positive Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

42. Assertion (A): Thevenin's theorem helps us to find current in a branch of a network for different values of impedances of that branch. Reason (R): Thevenin's equivalent circuit replaces a network by a voltage source in series with impedance.

A.

Both A and R are true and R is correct explanation of A

A.

True

B. False Both A and R are true and R is B. not the correct explanation of A C. A is true but R is false D. A is false but R is true Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

43. If a 'live' conductor of a public supply touches earth metal A.

Answer: Option A Explanation: No answer description available for this question. Let us 46. The dual of a loop is A.

twig

B. node pan C. mesh D. tree Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

supply voltage will increase

B. supply voltage will decrease C. no current will flow

47. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be A.

a voltage source

D. current will flow to earth Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

44. If a fuse is higher than required current rating is employed in a circuit, it will A.

blow more frequently since it carries more current

B.

afford better protection to the circuit

B. a current source C. both of the above D. none of the above Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

48. Consider the following statements : 1. Tellegen's theorem is applicable to any lumped networks.

C. seriously overload the circuit D. lead to larger maintenance cost Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

2. The reciprocity theorem is applicable to linear bilateral networks. 3. Thevenin's theorem is applicable to twoterminal linear active networks. 4. Norton's theorem is applicable to twoterminal linear active networks. Which of these statement are correct? A.

1, 2, and 3

B. 1, The 2 and 4 45. A series circuit has fixed resistance and variable reactance. impedance locus will be a straight line parallel to Y-axis.

C. 1, 2, 3 and 4

2. In carbon resistor colour code, the fourth band indicates tolerance.

D. 3 and 4

A.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

49. An RLC series circuit is excited by a step voltage E. The units of roots of characteristic equation are A.

seconds

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

3. For any given two port network, any parameter set can be determined from measurements made at the two ports.

B. 1/seconds

A.

C. tesla

B. False

True

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. henry Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

4. For 200V r.m.s. value triangular wave, the peak voltage will be 50. An excitation is applied to a system at t = T, and its response is zero for -∞ < t < T, such a A. 200 V system is A.

non-causal system

B. 222 V

B. Stable system

C. 280 V

C. causal system

D. 346 V

Answer: Option D Explanation: Answer: Option C No answer description available for this Explanation: question. Let us discuss. No answer description available for this question. LetView us discuss. Answer Discuss in 1. Bandwidth will be Forum Workspace Report A. a.b D. unstable system

B. a + b

5. According to initial value theorem which one is correct

C. a D. b

1.

Answer: Option C 2. Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 3.

4. A.

1, 4

B. 2, 3

C.

C. 4, 2 D. 1, 2 Answer: Option D Explanation: No answer description available for this question. Let us discuss. 6. A two terminal black box contains one of the elementsD. R, L, C. The black box is connected to 220 V as supply. The current is I, when a capacitance of 0.1 F is connected in series between the source and box, the current is 2I. The elements is A.

resistance

B. inductance C. capacitance of 0.5 F D. not identifiable form the given data

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 8. If Z(s) is positive real,

7. Which of the following graphs in figure correctly represents the variation of capacitive reactance with frequency?

then where k has only positive real values is also positive real. This hypothesis was first given by A.

O'Brune

B. R. Richards A.

C. Bott and Duffin D. P. S. Laplace Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. 9. For a voltage transfer function H(s), realizable by RLC network, the following statements are made 1. H(s) cannot have a pole at s = 0 2. H(s) cannot have a pole at s = ± j4 3. H(s) cannot have a pole at s = ∞ 4. H(s) cannot have a pole at s = + 2 Of these statements

A.

3 and 4 are correct

B. 2 and 4 are correct

becomes negative, i.e., varistor C. goes into negative resistance region

C. 1 and 2 are correct

D. none of these

D. 1 and 3 are correct Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

13. Current through a charging capacitor exhibits 10. In figure the effective resistance faced by voltage source is A. an exponential growth function B. an exponential decay function C. a step decay function D. a linear decay function A.

1Ω

B. 2 Ω C. 3 Ω

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. 3.3 Ω Answer: Option B 14. A battery charger can drive a current of Explanation: 5A with 1Ω resistance connected at its No answer description available for this question. Letoutput. us discuss. If it can charge 2 V battery at 7 A 11. A two port network is symmetrical if rate, its Thevenin's equivalent circuit will be A. z11 z12 - z12 z21 = 1 B. AD - BC = 1 C. h11 h22 - h12 h41 = 1

A.

7.5 in series with 0.5 Ω resistance

B.

1.25 V in series with 1.5 Ω resistance

D. y11 y22 = y12 y21 = 1

7.5 V in parallel with 0.5 Ω C. Answer: Option C resistance Explanation: 12.5 V in parallel with 1.5 Ω No answer description available for this question. Let us D. discuss. resistance View Answer Discuss in Forum Workspace Report

12. In a varistor, as the voltage increases beyond a certain value, its resistance A.

rapidly increases

B. rapidly decreases

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

15. For the given circuit, the current I is

A.

18. In the graph of figure, the total number of trees is

2A

B. 5 A C. 7 A A.

4

D. 8 A B. 5 Answer: Option C Explanation: C. 6 No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report D. 8 16. Assertion (A): In an R-L circuit having low resistance, current lags the voltage by nearly Answer: Option D 90°. Explanation: Reason (R): Power factor of a series RL circuit is R/Z. No answer description available for this A. Both A and R are true and R is correct explanation of A Let us discuss. question. View Answer Discuss in B. Both A and R are true and R is not the correct explanation of A Report Forum Workspace C. A is true but R is false D. A is false but R is true

19. In a sine wave, maximum rate of change of voltage occurs at

Answer: Option A Explanation: A. ascent of the waveform No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report B. + ve maximum C. - ve maximum 17. Two coils are so wound that 60% of the flux of one links the other. The coefficient of coupling is A.

1.67

B. 0.6 C. 0.36

D. between maximum and minimum Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. 0.216 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

20. Which of the following statements is incorrect? A.

A mesh with two resistors has two mesh currents

B. The algebraic sum of all voltages around any mesh

C. The principle node is a function where branch curre D. A Norton is a series circuit Answer: Option C Explanation:

No answer description available for this question. Let View us discuss. Answer Discuss in View Answer Discuss in Forum Workspace Report Forum Workspace Report 21. Hysteresis loss is proportional to A.

f and B1.6m 24. Network transients are due to

B. f and Bm

A.

C. f2 and Bm D. f and B 2

2

circuit resistance

B. circuit voltage

m

changes in energy stored in L C. Answer: Option A and C Explanation: D. discuss. circuit admittance No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

22. When a lead acid battery is fully charged the colours of its positive and negative plates are A.

grey and dark brown

B. dark grey and brown

25. The Laplace transform of i(t) is given by

C. grey and brown

A.

0

D. dark brown and grey Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

23. Two independence parameters Z11 and Z12 of the two-port network in the figure are

B. 2 C. 1 D. ∞ Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 26. In a loss-free R-L-C circuit the transient current is A.

oscillating

B. square wave C. sinusoidal D. non-oscillating

A.

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

Z11 = 2.75 Ω and Z12 = 0.25 Ω

B. Z11 = 3 Ω and Z12 = 0.5 Ω C. Z11 = 3 Ω and Z12 = 0.25 Ω D. Z11 = 2.25 Ω and Z12 = 0.5 Ω Answer: Option A Explanation: No answer description available for this question. Let us discuss.

27. If F(s) = A.

cos ω0t

B. sin ω0t

, then f(t) =

C. eat cos ω0t D. e-at cos ω0t Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

30. In steady state condition inductor behave as A.

28. In the network of figure it is desired that maximum power be supplied to Z2. The values of Z1 and Z2 are fixed. However the transformation ratio 'a' of transformer can be changed. The value of 'a' for maximum power transfer is

open circuit

B. short circuit C. current source D. voltage source Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. Assertion (A): Charge is dual of flux. Reason (R): Short circuit is dual of open circuit. A.

Both A and R are true and R is correct explanation

B. Both A and R are true and R is not the correct expl A.

|Z2|/|Z1|

B. [|Z2|/|Z1|]0.5 C. [|Z2|/|Z1|]2 D. [|Z2|/|Z1|]0.75 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. A is true but R is false D. A is false but R is true Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For ideal performance, a filter should be terminated in characteristic impedance. A.

True

B. False 29. The magnitude response of a normalised Butterworth low pass filter is A.

linear starting with value of unity at zero frequency and 0.707 at cut off frequency

non linear all through but with B. values of unity at zero frequency and 0.707 at cut off frequency C. D.

linear upto cut off frequency and nonlinear thereafter nonlinear upto cut off frequency and linear thereafter

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

33. For a symmetrical network A.

h11 = h22

B. h12 = h21 C. h11 h22 - h12 h21 = 0

37. Paper capacitors are used in power supplies for filtering.

D. h11 h22 - h12 h21 = 1 Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

34. The time constant of a series R-C circuit is given by A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

R/C 38. The transfer function of a system is given by H(s) = 1/s2 (s - 2). The impulse response of the system is

B. RC2 C. RC

A.

D. R2C Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

35. The function A.

A.

is an

(t2* e-2t) U(t)

B. (t* e2t) U(t) C. (te-2t) U(t) D. (te2t) U(t) Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

LC function

B. RC function C. RL function D. LC or RC function

39. In any two port network, input impedance is independent of load impedance. A.

True

Answer: Option A B. False Explanation: Answer: Option B No answer description available for this question. Let us discuss. Explanation: 36. If L [f(t)] = F(s), Lf(t - T) No answer description available for this A. esTF(s) question. Let us discuss. View Answer Discuss in B. e-sTF(s) Forum Workspace Report C. F(s) - e-sT D. F(s) + e-sT

40. Dielectric materials have high specific resistance.

A. True Answer: Option B Explanation: B. discuss. False No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

41. The resistance of a standard conductor. A.

C. A is N, C is S

increases with frequency D. A is S, C is neutral, B is N

B. same for ac and dc C. increases with frequency D. increases as square root of frequency

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 45. Steady state conditions are considered to be achieved in __________ time constant. 42. In a driving point function, the degrees of numerator and denominator polynomials in s may differ by either zero or one only. A.

A.

one

B. two C. four

True D. five

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option D Explanation: No answer description available for this question. Let us 46. Two impedances are connected in series. Three voltmete impedance and one across combination. The readings o angle between voltages across the two impedances is A.

30°

B. 60° 43. The sum of two sine waves of different frequencies is a sine wave. A.

True

B. False Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

44. When iron rod is magnetised by the flowing through its coil, the polarities of its different points will be

C. 90° D. 120° Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

47. In a series resonant circuit Q is more than 10. Then the lower half power frequency ω1, and resonant frequency ω0 are related as A.

ω1 = ω0 + bandwidth

B. ω1 = ω0 + 0.5 (bandwidth) C. ω1 = ω0 - 0.5 (bandwidth) D. ω1 = ω0 + bandwidth

A.

Pole A is N-pole, B is S-pole and C is neutral

B. A is N, B and C is S

Answer: Option C Explanation: No answer description available for this question. Let us discuss.

View Answer Discuss in Forum Workspace Report

Which one fo the statement given above are correct? A.

2 and 4

B. 1 and 3 48. In a series R-L circuit when excited by a 1 volt battery the current is 1 - e-t. If it is excited by a source 2 sin t, the current will be A.

2 sin (t - 45°) + e-t

B. 2 sin (t + 45°) + e-t

C. 1 and 4 D. 2 and 3 Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

C. sin (t - 45°) + e-t D. sin (t + 45°) + e-t Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

2. Two port network is said to be symmetrical if A.

Δh = 1

B. Z11 = Z2 C. A = Δ D. all

49. If R, L, C are in parallel, the currents through L and C are equal in magnitude at resonance. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

3. For a series resonant circuit at low frequency impedance is __________ and at high frequency circuit impedance is __________ . A.

capacitive, inductive

B.is positive. inductive, capacitive 50. In all pure metals, temperature coefficient of resistance A.

True

B. False

C. resistive, inductive D. capacitive, resistive

Answer: Option A Answer: Option A Explanation: Explanation: No answer description available for this question. LetNo usanswer discuss.description available for this View Answer Discuss in Forum Workspace Report question. Let us discuss. 1. Consider the following expression for the driving point impedance View Answer Discuss in Forum Workspace Report

1. It represent on LC circuit 2. It represent on RLC circuit 3. It has poles lying on the jω axis

4. If Y(s) = 1 + s, the network has A.

1 Ω resistor and 1 F capacitor in series

4. It has a pole at infinite frequency and a zero at zero frequency.

B.

1 Ω resistor and 1 F capacitor in parallel

C.

1 Ω resistor and 1 H inductor in series

D.

1 Ω resistor and 1 H inductor in parallel

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

5. In a Hurwitz polynomial A.

D. battery connections Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

8. Thevenin's equivalent circuit A.

can be drawn only in time domain

B.

can be drawn only in frequency domain

C.

can be drawn both in time and frequency domain

all coefficients are non-negative

can be drawn in frequency D. B. both the odd and even parts have roots on jω axis domain with some restrictions Option the continued fraction expansion is the ratio of Answer: odd to even partsCof a Hurwitz Explanation: polynomial yields all positive quotient terms No answer description available for this question. Let us discuss. D. all of the above View Answer Discuss in Answer: Option D Forum Workspace Report Explanation: No answer description available for this question. Let us discuss. 6. The polarities of the magnetised iron rod of are 9. A series RC circuit has fixed R and C and variable f. The current locus will lie in the first quadrant. C.

A. A.

A is N, B is S and C is neutral

B. A is N, B is S and C is S C. A is N, B is N and C is S D. A is S, N is S and C is N

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: No answer description available for this question.10. LetWhich us discuss. of the following statement is false? View Answer Discuss in Forum Workspace Report Bandwidth of a circuit is given by the range of frequ A. points 7. Nichrome is commonly used for A.

lamp filaments

B.

Half-power points on a resonance curve are those at resonance

B. transformer winding

C. Half-power points are also known as 3 dB points

C. heater coils

D. At both half-power points, the p.f. = 0.707 lagging Answer: Option D Explanation:

No answer description available for this question. Let A. us discuss. R/LC View Answer Discuss in Forum Workspace Report 11. For node 2 in figure, KCL equation is B. C/LR C. LC/R D. L/CR

A.

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B.

C.

D.

14. The hot resistance of a tungsten lame is about 12 times its cold resistance. Accordingly, the cold resistance of a 60 Ω, 120 V lamp is about __________ ohm. A.

5

B. 240 Answer: Option B Explanation: C. 2 No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report D. 2880

12. Which one of the following is positive real function? A.

B.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

15. The response of a function is decided by A.

C.

the location of its zeros

B. the location of its poles C. both (a) and (b)

D. Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. none of the above

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 16. An RL impedance function is to be synthesised in second to be expanded is A.

13. The dynamic impedance of an R-L and C parallel circuit at resonance is __________ ohm.

Z(s)

B. sZ(s) C. 1/Z(s)

No answer description available for this question. Let us discuss. Answer: Option D View Answer Discuss in Explanation: Forum Workspace Report No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report D. Z(s)/s

20. Q of a coil 17. Ideally an attenuator pad should not change A.

voltage level

B. impedance level C. power level D.

voltage, power or impedance level

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A. increases with Q increasing frequency B. varies linearly with frequency

C. increase with increasing frequency because R increases D. decrease after the peak frequency because R increases A.

B. C, D C. A, C D. B, D

Answer: Option B Explanation: No answer description available for this question. Let us 21. To neglect a current source the terminals across the sou A.

18. If two networks are connected in series of individual Z parameter as Za and Zb then equivalent Z is A.

A, B

replaced by some resistance

B. replaced by capacitance C. open-circuited

[Z] = [Za] + [Zb] D. short-circuited

B. [Z] = [Za] [Zb] C. [Z] = [Za]/[Zb] D. [Z] = [Za] - [Zb] Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

22. At very low temperatures, semiconducting materials behave as insulators. A.

True

B. False 19. The model of a system A.

is unique

B.

depends on desired degree of accuracy

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. depends on the type of analysis D. both (b) and (c) Answer: Option B Explanation:

23. The series element for a prototype high pass filter is

A.

resistive

B. inductive

Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

C. capacitive D. combination of L and C Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

24. The scale factor for half wave and full wave rectifier is __________ respectively. A.

1.11, 1.414

27. Which of the following is correct? A.

y22 = z22/|z|

B. y11 = z22/|z| C. z11 = y11/|y| D. z22 = y22/|y| Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. 1.11, 1.57 C. 1.57, 1.11 D. 1.414, 1.11 Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

25. The time constant of a series RL circuit is A.

LR

28. The transfer function G12 (s) for a two port is A.

V2/V1

B. V2 (s)/V1 (s) C. V2 (s)/I1 (s) D. I2 (s)/I1 (s) Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. L/R C. R/L

29. If admittance of a circuit is defined

D. e-R/L

as , then at resonance Answer: Option C A. mp = ql Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report B. mq = pl 26. The two conductors of a single phase transmission line C.suspended ml = pq in air carry currents in opposite directions. The force per unit length on each conductor varies D. none A. directly as the current in either conductor Answer: Option A B. directly as the distance between the two conductors Explanation: No answer description available for this C. directly as the square of the current in either conductor question. Let us discuss. Answer Discuss in D. inversely as the square of the distance betweenView the two conductors Forum Workspace Report Answer: Option C

30. If impedance of a circuit is defined as A.

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report then circuit is said to be in resonance if

ab = cd 33. As B is increased from zero to about 2T, μr, of a ferromagnetic material

B. bc = ad C. ac = bd

A.

increase

D. none

B. decrease Answer: Option B C. first increases then decreases Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report D. remains the same 31. In figure, the current I Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

is 2 A from A to B

34. In open circuit impedance parameters, the independent variables are

B. is 2 A from B to A

A.

I1 and I2

C. depends on the value of R B. V1 and V2 D. none of the above C. V1 and I1 Answer: Option C Explanation: D. V2 and I2 No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report Answer: Option A Explanation: No answer description available for this question. Let us discuss. 32. Consider the following statements View Answer Discuss in Forum Workspace Report 1. Current through inductor cannot change abruptly. 2. Voltage across capacitor cannot change abruptly. 3. Initial value of f(t) is

sF (s).

4. Final value of f(t) is sF (s). Of the above statements A.

35. Lead becomes a superconductor at A.

9.1 K

B. 7 K C. 5 K

3 and 4 are correct D. 3 K

B. 1 and 4 are correct C. 1 and 2 are correct D. 2 and 3 are correct Answer: Option C Explanation:

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 36. An RLC series circuit is excited by a step voltage E. The the s domain circuit the element L will be replaced by

View Answer Discuss in Forum Workspace Report B. an impedance sL in series with current source i(0) A.

an impedance sL.

C.

40. When R and L are connected in parallel, R > |Z|. an impedance sL in series with a voltage sourceA. True

-1). D. an impedance sL in series with a voltage sourceB. Li(0False

Answer: Option D Answer: Option A Explanation: Explanation: No answer description available for this question. LetNo usanswer discuss.description available for this question. Let us View Answer Discuss in Forum Workspace Report View Answer Discuss in Forum Workspace Report 41. In low pass filter of figure R0 = 1 Ω and cut off frequency are 37. In drawing phasor diagrams, RMS values are used. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

1 H and 2 F

B. 1 H and 1 F C. 2 H and 1 F D. 1 H and 2 F

38. If two networks are connected in parallel then equivalent y parameter of both is A.

[y] = [ya] [yb]

Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

B. [y] = [ya] + [yb] C. [y] = [ya]/[yb] D. none Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

39. RMS value is always higher than average value. A.

True

42. A second order system will have A.

all resistances

B. resistances and inductances C.

resistances, inductance and capacitances

D. either (b) or (c) Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss.

43. In figure, the power dissipated in 4 resistance is P1 and power associated

with 3 A source is P2. Then

D. reciprocal and active Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

A.

P 1 = P2

B. P1 < P2

47. The network shown in figure is

C. P1 > P2 D. P1 may be equal or less than P2 Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

reciprocal

B. reciprocal and symmetrical 44. L/C has the dimension of A.

time

B. capacitance C. inductance D. resistance Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. non-reciprocal D. unsymmetrical Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

48. h parameters are used in transistor analysis. A.

45. In metals, the flow of current is due to A.

electrons

B. ions C. holes D. electrons and ions

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: 49. At a temperature of 7 K, lead is a No answer description available for this question. Let us discuss. superconductor. View Answer Discuss in Forum Workspace Report A. is True 46. The shot circuit admittance matrix of a two port network A.

non-reciprocal and passive

B. non-reciprocal and active C. reciprocal and passive

B. False Answer: Option A Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

50. Which of the under-given graphs shown in figure2.gives In an variation LC immittance in resistance H (s)of a copper conductor with temperature? the slope of dH (jω)/dω is always A. negative B.

the slope of dH (jω)/dω is always positive

C.

the slope of dH (jω)/dω may be positive or negative

D.

the slope of dH (jω)/dω is constant

A.

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B.

3. The response shown in figure is C.

A.

over damped

B. critically damped C. under damped D.

D. either (a) or (c)

Answer: Option C Explanation: No answer description available for this Answer: Option B question. Let us discuss. Explanation: View Answer Discuss in No answer description available for this question. LetForum us discuss. Workspace Report View Answer Discuss in Forum Workspace Report 1. A choke coil of resistance R and inductance L is shunted by capacitor C. The dynamic resistance is 4. The polar plot of P (jω) = 45° as ω A.

R/LC

B. C/RL C. L/RC D. 1/RLC

varies from -∞ to ∞ is A.

a straight line parallel to x-axis

B. a straight line parallel to y-axis

C.

a line passing through origin and inclined at 45°

a line in first quadrant passing D. through origin and inclined at 45° to positive x-axis Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

8. In the voltage equation v = 500 sin (1000t) V, the rms value of voltage is A.

500 V

B. 5002 V C.

5. Assertion (A): A graph is planar if it has a dual. D. 1.1 x 500 V Reason (R): The dual of a graph can be found by window dot method. Answer: Option C A. Both A and R are true and R is correct explanation of A Explanation: No answer description available for this B. Both A and R are true and R is not the correct explanation of A question. Let us discuss. View Answer Discuss in C. A is true but R is false Forum Workspace Report D. A is false but R is true Answer: Option C 9. In figure, the short circuit current through Explanation: terminal AB will be No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 6. As x is increased from - ∞ to ∞, the function A.

monotonically increases

B. monotonically decreases C. increases to a maximum value and then decrease A. 1.5 A D. decreases to a minimum value and then increases B. 3 A Answer: Option A Explanation: C. 2 A No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report D. 1 A

7. Which of the following expressions is true for apparent power in an A.C. circuit? A.

VI cos Φ

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. Vav x Iav C. Vr.m.s x Ir.m.s D. Vpeak x Ipeak Answer: Option C Explanation:

10. A parallel ac circuit in resonance will A.

act like a resistor of low value

B. have a high impedance

C. have current in each section equal to the line current C. -90 ° D. have a high voltage developed across each inductive D. 0°and capacitive section Answer: Option B Answer: Option B Explanation: Explanation: No answer description available for this question. LetNo usanswer discuss.description available for this View Answer Discuss in Forum Workspace Report question. Let us discuss. 11. Which pair is correctly matched? View Answer Discuss in Forum Workspace Report A. Symmetrical two port AD - BC = 1 B. Reciprocal two port z11 = z12 C. Inverse hybrid parameter A, B, C, D

14. The ideal voltmeter V of figure will read __________ volt.

D. hybrid parameter (V1, I2) = f(I1, V2) Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. 12. Mesh analysis is applicable __________ only.

0

B. 10

planar network

C. 5

B. non planar network

D. 1

A.

C.

a circuit which contains only current sources

D. none Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

15. The circuit of figure is generally employed as a

13. In the circuit shown the voltage Vs has a phase angle of __________ with respect to VL. A.

bridge

B. low-pass filter C. peaking network D. high-pass filter A.

120°

B. 60 °

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 16. A nickel cadmium cell is an alkaline cell.

Answer: Option D Explanation: No answer description available for this B. False question. Let us discuss. Answer: Option A View Answer Discuss in Explanation: Forum Workspace Report No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A.

True

20. In most electric irons, the thermister used for controlling t 17. When analysing two port networks in parallel it is more convenient to use A.

A.

vapour-filled bulb

B. high-expansion steel rod

z parameters C. bimetallic strip

B. h parameters D. thermopile C. T parameters D. y parameters Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 21. In a series RLC high Q circuit the current peaks at a freq A.

equal to the resonant frequency

B. greater than the resonant frequency C. less than the resonant frequency

18. In ZRC (s) = 0 at s = ∞, the last element in first Cauer form is A.

R

B. C

D. none Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

C. R and C in series D. R and C in parallel Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

19. The function H (s) is positive real if A.

H (s) has no poles or zeros in right half plane

The poles of H(s) on the B. imaginary axis are simple with real and positive residues C. Re [H(jω)] ≥ 0 for 0 ≤ ω ≤ ∞ D. all of the above

22. Assertion (A): A complicated waveform can be replaced by sum or difference of two or more waveforms. Reason (R): The method of superposition is applicable only to linear systems. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false D. A is false but R is true Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A. 23. The phase velocity v in a transmission line is A.

LC

B. C/L C. L/C D. 1/LC Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

h12 = - h21

B. AD - BC = 1 C. y12 = y21 D. all Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

27. For the current wave i = 10 + 10 sin θ, the rms value is A.

10 A

B. 12.247 A 24. A circuit is fed by two sources of different frequency and magnitudes 100 ∠0° V and 50 ∠30°V. The current in a particular branch is 10 ∠20° A. If the magnitudes of the sources are changed to 200 ∠0° V and 100 ∠0° V, the current in that branch should be A.

20 ∠20° A

B. 10 ∠20° A C. 14.14 ∠20° A

C. 20 A D. 14.14 A Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

28. In figure, I =

D. 10 ∠- 20° A Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

25. In gases the flow of current is due to A.

A.

positive ions only

B. electrons only C. electrons, positive ions and negative ions

B. C.

D. electrons and positive ions D. Answer: Option C Explanation: Option D No answer description available for this question. LetAnswer: us discuss. Explanation: View Answer Discuss in Forum Workspace Report No answer description available for this 26. A two port network is said to be reciprocal if question. Let us discuss.

View Answer Discuss in Forum Workspace Report

A.

Superposition theorem

B. Compensation theorem 29. The impedance parameter z21 is A.

transfer impedance at port 1 with port 2 open circuited

B.

transfer impedance at port 1 with port 2 short circuited

C.

transfer impedance at port 2 with port 1 open circuited

D.

transfer impedance at port 2 with port 1 short circuited

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. Millman's theorem D. Thevenin's theorem Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

33. If Ia, Ib, Ic are line currents and Ia1 is the positive sequences component of Ia then A.

Ia1 = Ia + Ib + Ic

B. C.

30. Measurement of an unknown voltage with a dc potentiometer loses its advantage of open circuit measurement when D. A.

the primary circuit battery is changed

Answer: Option C Explanation: B. standardization has to be done again to compensate for drifts No answer description available for this question. Let us discuss. C. voltage is larger than range of the potentiometer View Answer Discuss in D. range reduction by a factor of 10 is employed Forum Workspace Report Answer: Option C Explanation: thediscuss. numerator of Z(s) is one degree No answer description available for this question.34. LetIfus higher than denominator, Z(s) has a 31. A parallel resonant circuit can be used pole at infinity. A. as a high impedance A. True B. to reject a small band of frequencies B. False C. both (a) and (b) Answer: Option A Explanation: No answer description available for this Answer: Option C question. Let us discuss. Explanation: View Answer Discuss in No answer description available for this question. LetForum us discuss. Workspace Report View Answer Discuss in Forum Workspace Report D. to amplify certain frequencies

32. Which of the following theorems enables a number of voltage (or current) sources to be combined directly into a single voltage (or current) source?

35. An m derived low pass filter has fc = 1000 Hz, f∞ = 1250 Hz and m = 0.6. If m is increased, then A.

both fc and f∞ will increase

B. both fc and f∞ will decrease C.

fc will remain constant but f∞ will decrease

D.

fc will remain constant but f∞ will increase

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

36. In the two ports network shown in the figure, Z12 and Z21 are, respectively

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

38. The design of wave filter is based on characteristic impedance which is A.

pure resistance

B. pure reactance pure resistance in pass band and C. pure reactance in attenuation band pure reactance in pass band and D. pure resistance in attenuation band

A.

re and βr0

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. 0 and - βr0 C. 0 and βr0 D. re and - βr0 Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

37. In figure, I = 2A, then V =

39. A system is said to be marginal stable if A.

poles lies on Real axis

B. zero lies on Real axis C. poles lies on Imaginary axis D. zeros lies on origin Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

40. Assertion (A): In state space analysis, capacitors are ta Reason (R): State variable analysis is very suitable for c A.

5V

B. 3 V C. 2 V D. 1 V

A.

Both A and R are true and R is correct explanation

B. Both A and R are true and R is not the correct expl C. A is true but R is false D. A is false but R is true Answer: Option B

Explanation: A. 1/C No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report B. (A - 1)/C 41. In the circuit shown in the given figure, V0 is given by C. 1/B D. (D - 1)/C Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

44. The value of current read by ideal ammeter A in figure is __________ ampere.

A.

B. C. sin t D. cos t Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. 0 42. The factor which will have least effect on the voltage at the load end of a two-wire supply circuit is A.

length of the circuit

whether supply frequency is 25 B. Hz or 50 Hz C. amount of load on the circuit D. cross-section of the circuit wires Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. 3 C. 2.5 D. 5 Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

45. In ZRC (s) = constant at s = 0, the last element in first Fos A.

R

B. C C. R and C in series

43. If a two port network is represented by an equivalent T network, the impedance of shunt arm in terms of ABCD parameters is equal to

D. R and C in parallel Answer: Option A Explanation: No answer description available for this question. Let us

View Answer Discuss in Forum Workspace Report Apparent power = (actual 46. For a full rectified sine wave, the form factor and peakC. factor respectively are power)2 2 - (reactive power) A.

1.57 and 2

B. 1.57 and 2

D.

Apparent power = (actual power)2 + (reactive power)2

Answer: Option D Explanation: No answer description available for this D. 1.11 and 2 question. Let us discuss. Answer: Option C View Answer Discuss in Explanation: Forum Workspace Report No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report C. 1.11 and 1.11

50. Quality factor will be 47. For an RC admittance function Y,

A.

a/b

Y(∞) < Y(0)

B. b/a

B. Y(0) < Y(∞)

C. b/a

A.

C.

Y (∞) may be lesser or greater than Y(0)

D. Y(∞) = Y(0) Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. ab

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 1. In the circuit shown in the given figure, switch k is closed relaxed then which one of the following sources of v(t) wi 0+?

48. When ac current is zero, no electrons are in motion. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

49. The relation between the apparent power, actual power and reactive power is given by A.

Apparent power = actual power + reactive power

Apparent power = actual power B. reactive power

A.

Unit step

B. Unit impulse C. Unit ramp D. Unit step plus unit ramp Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

2. Pick the correct statement A.

Delta connection draws same current as star connection

Delta connection draws 3 times B. as much current as star connection

5. When a current flows through a conductor, A.

an electric field exists at all points within the conduc

B. electric field exists only at all points on the surface C. Delta connection draws of the current of star connection D. Delta connection draws of the current of delta connection Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. electric field exists only at ends of the conductor

D. any of the above depending on magnitude of curren

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 6. In the analogy between electric and magnetic circuits per A.

resistivity

B. conductivity C. electric field intensity D. current density

3. The inverse Fourier transform of A.

is sin ωt

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

B. cos ωt C. sgn (t) D. u (t) Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

4. The colour on the extreme left in general purpose fixed resistors represents A.

first significant digit

7. Two port circuits are connected in parallel. To determine the response, it is more convenient to use A.

O.C. impedance parameters

B. S.C. admittance parameters C. ABCD parameters D. h parameters Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. tolerance C. wattage rating D. voltage rating Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

8. The dual of a link is A.

twig

B. node C. loop D. tree branch Answer: Option D Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

9. A network is said to be two port network if there is 1. no independent source in the network 2. no dependent source in the network 3. non-linear component in the circuit 4. no external connection exist between I/P and 0/P A.

1, 2, 3

B. 3, 4, 2

12. A series RLC circuit is supplied from a variable frequency source. The resonant frequency is ω0. The voltage across L is maximum at a frequency A.

equal to ω0

B. slightly less than ω0 C. slightly more than ω0 D. none of the above Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. 1, 3, 4 D. 4, 3, 1, 2 Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

13. Current in a 2H inductance in 10e-t A. Admittance of the inductor is A.

-0.5 mho

B. 0.5 mho C. 5 mho D. 10 mho

Answer: Option A Explanation: No answer description A. the number of tree branches is always less than the number of links available for this question. Let us discuss. B. the number of tree branches is always more than theAnswer numberDiscuss of links in View Forum Workspace Report C. the number of tree branches and links are always equal

10. In a network

D. the number of tree branches has no relation with the number of links 14. A constant k low pass filter has fc = 1000 Answer: Option B Hz. At f = 500 Hz, the phase shift is Explanation: A. discuss.  No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report zero 11. For a series circuit of R and variable XL the admittanceB.locus is A.

a semicircle in first quadrant

B. a semicircle in fourth quadrant

C. more than  D. less than 

Answer: Option D Explanation: No answer description available for this D. a straight line in fourth quadrant question. Let us discuss. Answer: Option B View Answer Discuss in Explanation: Forum Workspace Report No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report C. a straight line in first quadrant

15. At resonance the network function magnitude will be B. V < V B0 Y0 A. k/a C. VB0 = VY0 B. k/b D. VB0 = VBY C. c Answer: Option A Explanation: No answer description available for this Answer: Option A question. Let us discuss. Explanation: View Answer Discuss in No answer description available for this question. LetForum us discuss. Workspace Report View Answer Discuss in Forum Workspace Report 16. Giga watt is equal to D. k/a + b

A.

1012 W

19. Reciprocity theorem is applicable to

B. 109 W

A.

circuits with one source

C. 106 W

B.

circuits with only one independent source

D. 103 W

circuits with any number of C. Answer: Option B sources Explanation: No answer description available for this question. Let us discuss. circuits with any number of View Answer Discuss in Forum Workspace Report D. independent sources

17. Which one of the following is a cut set of the graph in the given figure?

A.

1, 2, 3, and 4

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

20. The first and the last critical frequencies (singularities) of of a passive network having two kind of elements, are a p above property will be satisfied by A.

RL network only

B. 2, 3, 4, and 6 B. RC network only C. 1, 4, 5, and 6 C. LC network only D. 1, 3, 4, and 5 Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. RC as well as RL network Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 21. In a circuit with capacitance connected to ac source, the is constant. A.

18. A 3 phase star-connected load has one capacitor C in R phase and two equal resistances in Y and B phases.The phase sequence is RBY. Then A.

VB0 > VY0

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us

View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

22. Assertion (A): If Z1(s) and Z2(s) are positive real then Z1(s) + Z2(s) as well as 1/Z1(s) and 1/Z2(s) are positive real. Reason (R): The poles of a positive real function are real or occur in conjugate pairs. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

D. link

25. At t = 0+, the current i1 is

C. A is true but R is false D. A is false but R is true Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

- V/2R

B. - V/4R C. - V/R D. zero

23. A variable resistance R and capacitive reactance XC are connected in series. As R is varied, the locus of Z is A.

a straight line parallel to Y axis in 4th quadrant

B.

a straight line parallel to X axis in 4th quadrant

C.

a straight line parallel to Y axis in second quadrant

D.

a straight line parallel to Y axis in first quadrant

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 26.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

24. The dual of a node is A.

mesh

B. principal node C. tree branch

27. The double energy transients occur in the A.

pure inductive coil

B. R-L circuit

30. Which one of the following theorem can be conveniently consumed by the 10 Ω resistor in the network shown in t

C. R-C circuit D. R-L-C circuit Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A. 28. The capacitance of a parallel plate capacitor varies as per the equation C(t) = C0 (1 - cos ωt). It is connected to a battery of V volts. The equation for current is A.

ωC0V (1 - cos ωt)

B. ωC0V(1 - sin ωt) C. ωC0V (1 - sin 2ωt) D. ωC0V sin ωt Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

29. Which one of the following is a passive device/Component? A.

Transformer

B. Oscillator

Thevenin's theorem

B. Maximum power transfer theorem C. Millman's theorem D. Superposition theorem Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. Kirchoff's laws are applicable to A.

dc circuits

B. circuits with sinusoidal excitation only C. dc circuits and circuits with sinusoidal excitation D. circuits with any excitation Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. Figure shows a parallel resonant circuit having resonance frequency of 15 MHZ. At this frequency

C. Generator D. None Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

its impedance is minimum

B. its impedance is maximum C. its impedance is infinite D. its impedance is zero Answer: Option B Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

33. In an R-C circuit, there is an initial voltage of 3 V across the capacitor. In s domain equivalent circuit, the voltage source to take into account the initial voltage has a strength of

D. bandwidth is large

Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 36. Assertion (A): When a square periodic wave is applied t capacitor is observed to be a triangular periodic wave. Reason (R): The RC circuit works as integrator and its ti time period of input wave. A.

Both A and R are true and R is correct explanation

B. Both A and R are true and R is not the correct expl

A. B. 3s

C. A is true but R is false D. A is false but R is true

C. D. 3Cs Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

34. An electrical network with 8 independent nodes will have __________ nodal equations. A.

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

37. Assertion (A): In a series resonant circuit current is maximum at resonance. Reason (R): The inductive and capacitive reactances are equal. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

4

B. 6 C. 7 D. 8 Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. A is true but R is false D. A is false but R is true Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

38. Laplace transform of a unit doublet U2 (t) is A.

35. An RLC series circuit has axis, then A.

Q is high

B. Q is low C. ω0 is high

1/s

. If B. the poles p1 and p1* are close to jω s C. 0 D. 1 Answer: Option B Explanation:

No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. 15 ∠45° C. 20 ∠45° D. zero

39. A series RL circuit is excited by a voltage v(t) = Ve-at such that a = R/L. Then the circuit current is

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

A. 42. A network is said to be non-linear if it does not satisfy

B.

A.

homogeneity condition

B. superposition condition

C.

C. both (a) and (b) D.

D. associative condition

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

43. A measured reactance across functionthe terminal 1 and 2 40. In the transformer shown in the figure, the inductance was 4 H with open terminals 3 and 4. It was 3H when A. the terminals 3 at and 4 were short has a pole origin circuited. The coefficient of coupling would be B. has a zero at origin C. may have a pole or zero at origin D.

A.

1

B. 0.707 C. 0.5

has a pole or zero at origin and a pole or zero at infinity

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. indetermine due to insufficient data 44. The condition on R, L and C such that Answer: Option D the step response y(t) in the figure has Explanation: no oscillation, is No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 41. An ac network has two sources of the same frequency. The currents in one branch when the sources act independently are 10 ∠30° A and 10 ∠60° A. When both sources act, the current in the branch should be A.

19.32 ∠45°

D. both (a) and (b)

A.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B.

C.

D. Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

48. In the transformer shown in figure, the inductance measured across terminal 1 and 2 was 4 H with terminals 3 and 4 open. It was 3H when terminals 3 and 4 are short circuited. The coefficient of coupling is

45. At a frequency less than the resonant frequency A.

series circuit is inductive and parallel circuit is capacitive A. 1 B. series circuit is capacitive and parallel circuit is inductive B. 0.707 C. both circuits are capacitive C. 0.5 D. both circuits are inductive indeterminate due to insufficient D. Answer: Option B data Explanation: Option C No answer description available for this question. LetAnswer: us discuss. Explanation: View Answer Discuss in Forum Workspace Report No answer description available for this 46. The voltage of single phase supply to residential consumers in India is question. Let us discuss. A. 400 V View Answer Discuss in Forum Workspace Report B. 230 V C. 2.2 kV D. 11 kV

49. The time constant of the network shown in figure is, when switch is closed.

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

47. Power factor of the following circuit will be unity A.

inductance A.

B. capacitance C. resistance

B.

2RC

C. RC/2

C.

will be 45° at ω = 0 and 0° at ω = ∞

D.

will be 45° at ω = 0 and 90° at ω =∞

D. none Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

50. For an ideal transformer A.

only Y parameter exist

B. only Z parameter

3. The graph of a network is shown in the figure. Which one of the figure shown is not a tree of the graph?

C. Z, Y both exist D. neither Z parameter nor Y parameter exist Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 1. The relation AD - BC = 1 where A, B, C, D are transmission parameters of a network is valid for A.

every network

B. passive but not reciprocal network

A.

C. passive and reciprocal network D. both active and passive networks Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report B.

2. In figure the phase plot

C.

A.

will be 90° at ω = 0 and 0° at ω = ∞

B.

will be 0° at ω = 0 and 90° at ω = ∞

Explanation: No answer description available for this question. Let us d View Answer Discuss in Forum Workspace Report 6. D.

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

4. A network N is dual of network N if A.

both of them have same mesh equation

B.

both of them have same node equation

C.

mesh equation of one are the node equations of the other

D.

KCL and KVL equations are the same

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

7. For an RC admittance function A.

all poles and zeros are simple

B.

all poles and zeros are simple and lie on negative real axis

C.

all poles and zeros lie on imaginary axis

5. The resistance of the aluminium conductor ( = 2.83 x 10-8 Ωm) in figure is all poles and zeros lie on positive D. real axis Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report A.

0.001 Ω

B. less than 0.001 Ω

8. If resistance is 20 Ω and inductance is 2 H in a R-L series circuit, then time constant of this will be

C. more than 0.001 Ω

A.

D. more than 0.002 Ω

B. 0.1 s

Answer: Option B

0.001 s

C. 10 s D. 100 s Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

9. The following table gives some Laplace transforms and the functions f(t) F(s) 1. δ(t) s 2. u(t) 1/s 3. tu(t) 2/s2 4. t2u(t) 2s3 Of these the correctly matched pairs are A.

D. both steady state and transient condition but with s Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

12. In solid dielectrics the rate of deterioration doubles for every 10-12°C rise in temperature. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

2 and 4

B. 1 and 4 C. 2 and 4 D. 1 and 2 Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

13. An RLC series circuit is excited by a step voltage E. The circuit current at t = 0 is A.

E/R

B. E/LC C. zero D. infinity

Answer: Option C Explanation: No answer description available for this question. Let us discuss. 10. In series as well as parallel resonant circuits, increasing the value of resistance would lead View Answer Discuss in to Forum Workspace Report A. decrease in bandwidth of both the circuits B. increase in bandwidth of both the circuits

14. The Laplace transform of a function f(t) u(t) is __________ C. decrease in bandwidth in series circuit and increase in parallel circuit where f(t) is periodic with period T, and y(S) times the L.T. of f(t) for first D. increase in bandwidth in series circuit and decrease in parallel circuit period. Then Answer: Option C A. s Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report B. 11. Kirchoff's laws are applicable to A.

steady state conditions only

C. eTs

B. transient conditions only C. both steady state and transient condition

D.

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. R/ωC Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

15. What are the ABCD parameters of the single elements circuit given below? 18. The colour code of a carbon resistance is yellow-violet-orange silver. The value of resistance is A. A.

57000 Ω ± 5%

B. 47000 Ω ± 10% C. 47000 Ω ± 5% D. 57000 Ω ± 5%

B.

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C.

D. 19. Choose the correct option Answer: Option A 1. Transit period is the time between two Explanation: steady state No answer description available for this question. Let us discuss. 2. Transient Response is the response due View Answer Discuss in Forum Workspace Report internal energy stored in circuit 16. For representing two sinusoidal voltages on a phasortodiagram A.

Both voltages must be of the same frequency 3. Transit response is also called natural response B. Both voltages must be sinusoidal but may be of different frequencies 4. Transit response arises due to presence of C and L in the circuit C. One of the voltages must be of 50 Hz 5. ofTransit D. The frequency of one must be integral of that other is due to R, L, C in the circuit A. 4, 3, 2 , 1 Answer: Option A Explanation: B. discuss. 5, 4, 3, 2 No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report C. 5, 4, 3, 1 D. 5, 1, 4 17. While using Maxwell bridge, the Q factor of a coil is obtained as A.

1/ωCR

B. ωCR C. ωC/R

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

20. If current is less than 20 mA and time of contact is very No small, answer the description effect of current available on for human this body is likely to be temporary. question. Let us discuss. View Answer Discuss in A. True Forum Workspace Report B. False Answer: Option A 24. Electric shock is Explanation: No answer description available for this question. Let us A. discuss. always fatal View Answer Discuss in Forum Workspace Report B. never fatal 21. A dielectric should have poor heat conductivity. A.

True

B. False

C. sometimes fatal D. always disfiguring

Answer: Option B Answer: Option C Explanation: Explanation: No answer description available for this question. LetNo usanswer discuss.description available for this View Answer Discuss in Forum Workspace Report question. Let us discuss. View Answer Discuss in Forum Workspace Report 22. The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its A.

sensitivity

25. The first critical frequency nearest the origin of the comp driving point impedance will be A.

a zero in left half plane

B. attenuation

B. a zero in right half plane

C. selectivity

C. a pole in left half plane

D. modulation

D. a pole or zero in left half plane

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 26. If Ia, Ib, Ic are line currents and Ia0 is the zero sequences c A.

23. Assertion (A): A graph can have many trees. Reason (R): The number of tree branches is equal to number of nodes. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

Ia0 = Ia

B. Ia0 = Ia + Ib + Ic C.

D. Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

D. A is false but R is true Answer: Option D Explanation:

27. The polynomial P (s) = (s - 1) (s2 + 1) (s + 2) (s + 3) is A.

Hurwitz but not strictly Hurwitz

B. not Hurwitz C. strictly Hurwitz D. anti/Hurwitz Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

30. Two coils having equal resistance but different inductanc time constant of the series combination is A.

average of the time constants of individual coils

B. sum of the time constants of the individual coils 28. If a resistance R of 1 Ω is connected between A and B in figure, current flowing through R is

C. geometric mean of the time constants of individual D. product of the time constants of the individual coils Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 31. The circuit shown in figure is a

A.

1A

B. 0.5 A C. 0.25 A D. 0.125 A Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

29. Assertion (A): In drawing an electric circuit analogous to a mechanical circuit, spring is replaced by capacitance. Reason (R): The behaviour of a spring and capacitor are similar. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false D. A is false but R is true

A.

low pass filter

B. high pass filter C. band pass filter D. band stop filter Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

32. For a reactance function H(s) A.

Re [H(jω)] is positive for ω ≥ 0

B. Re [H(jω)] is zero for ω ≥ 0 C.

Re [H(jω)] is positive or zero for ω≥0

D.

Re [H(jω)] is zero or negative for ω≥0

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report 36. The flux linkage ψ, self inductance L and current i are rel A.

ψ = L/i

B. ψ = Li C. ψ = Li2

33. A sinusoidal current having peak value of 7.07 A is superimposed on dc of 5A. If a hot-wire ammeter is used to measure the combined current in the circuit, it will indicate __________ ampere. A.

7.07

D. Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

B. 10 C. 12.07 D. 2.07 Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

37. Assertion (A): A band elimination filter attenuates signals whose frequencies lie between the cutoff frequencies. Reason (R): A band elimination circuit is very different from band pass circuit. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false 34. An ideal current source has A.

infinite source resistance

B. zero source resistance C. large value of source resistance D. finite value of source resistance Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. A is false but R is true Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

38. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will A.

be reduced by half

B. be doubled 35. The series element in band pass filter is A.

capacitive

B. inductive

C. be four times as high D. be reduced to one fourth

Answer: Option A Explanation: C. parallel combination of inductance and capacitance No answer description available for this D. series combination of inductance and capacitance question. Let us discuss. View Answer Discuss in Answer: Option D Forum Workspace Report Explanation: No answer description available for this question. Let us discuss.

D. is reciprocal of Thevenin's circuit 39. Two coupled coils lie in parallel planes such that 50% of magnetic flux produced by one links the other. The coefficient of coupling is A.

0.5

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. 0.25 C. 0.125 D. 0.5 Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

40. The unit of permeability is A.

43. The poles and zeros of a positive real functions are real or occur in conjugate pair. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

T

B. Wb C. H/M D. H

44. A coil is connected across a 200 V, 50 Hz supply and takes a current of 10 A. The loss in the coil is 1000 W. The impedance and resistance of the coil are

A. 10 Ω, 8 Ω Answer: Option C Explanation: B. discuss. 15 Ω, 8 Ω No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report C. 20 Ω, 10 Ω 41. For an RC admittance function D. 30 Ω, 15 Ω A. the lowest critical frequency is a zero Answer: Option C Explanation: No answer available C. the lowest critical frequency is zero and the highest criticaldescription frequency is a pole for this question. Let us discuss. View Answer Discuss in D. the lowest critical frequency is a pole Forum Workspace Report Answer: Option C Explanation: No answer description available for this question. Let us discuss. 45. In liquids charge carriers are electrons only. View Answer Discuss in Forum Workspace Report A. True B. the highest critical frequency is a pole

42. Norton's equivalent circuit A.

is same as Thevenin's circuit

B.

has no relation with Thevenin's circuit

C. is dual of Thevenin's circuit

B. False Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

46. The current I flowing in the branch is

3. inductance dissipates energy Which of the above is/are correct? A.

1, 2, and 3

B. 1 and 3 C. 3 only D. 1 and 2 A.

-12 A

B. 12 A C. 3 A

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. -3 A Answer: Option A 49. In an ac circuit that delivers constant Explanation: power at varying p.f., the current is No answer description available for this question. Let us discuss. A. lowest when p.f. is leading View Answer Discuss in Forum Workspace Report B. lowest when p.f. is lagging 47. In figure, the ratio V(s)/I(s) is

C. lowest when p.f is unity D. the same for all power factors

A.

R

B. R + sL C.

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

50. The parameter A of a two port network is equal to A.

V2/V1 with I1 = 0

B. V1/I2 with V2 = 0 D. Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

C. I1/I2 with V2 = 0 D. V1/V2 with I2 = 0

Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 1. A series RLC circuit is supplied from a variable frequency frequency is ω0. The voltage across C is maximum at a f equal to ω0

48. Consider the following: Energy storage capability of basic passive elements is due to the fact that

A.

1. resistance dissipates energy

C. slightly more than ω0

2. capacitance stores energy

B. slightly less than ω0

D. none of the above A.

a line representing the magnitude and direction of an alternating quantity

Answer: Option B Explanation: No answer description available for this question. Let us discuss. a line which represents the View Answer Discuss in Forum Workspace Report B. magnitude and phase of an alternating quantity 2. The maximum phase difference between the applied voltage and current in a RLC series current with finite values of R, L, C, and f can be A.

less than 90°

B. less than 45° C. 180° D. 30° Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

3. If figure, I = 2A if R = 20 Ω. When R = 10 Ω current I is

an instrument used for measuring C. phases of an unbalanced 3phase load a coloured tag or band for D. distinguishing between different phases of a 3-phase supply Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

5. The phase difference (jω - p1 ) A.

phasor directed from p1 to jω

B. phasor directed from origin to p1 C. phasor directed from origin to jω point D. phasor directed from jω to p1

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 6. Pick the correct statement with respect to following figure A.

1A

B. 2 A C. 2.5 A D. 3 A Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

4. A phasor is

A.

both the circuit are not identical filter Ckts

B. identical filter circuit at all frequencies C. identical filter circuit at low frequency D. identical filter circuit at high frequency Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

7. Permittivity has the units of F/m. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. False Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 11. Parallel wire transmission line is an example of A.

lumped network

B. distributed C. depend upon I/P signal strength D. power I/P

8. A capacitor used for power factor correction in single- phase circuit decreases A.

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

the power factor

B. the line current C.

both the line current and the power factor

D.

the line current and increases power factor

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

12. A 2-terminal network consists of one of the RLC elements. The elements is connected to an ac supply. The current through the element is 1 A. When an inductor is inserted in series between the source and the element, the current through the element becomes 2 A. What is this element? A.

A resistor

B. An inductor C. A capacitor

9. Which one of the following is an active component? A.

D. Cannot be single element Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Diode (p-n)

B. Transistor as Amplifier C. Transformer D. Inductor Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

13. In figure, values of C and R are

10. A series RL circuit is switched on to an impulse. A δ(t) at t = 0. Then A.

True

. The

No answer description available for this question. Let us 16. In figure, the switch is initially open. At t = 0 switch is clos

A. B. C. D. Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

60 V and - 0.3 A

B. 150 V and zero C. zero and 0.3 A D. 90 V and - 0.3 A

14. Consider the following statements for a driving point function F(jω): 1. Re F(jω) is an even function of ω and is 0 or positive for all values of ω. 2. Im F(jω) is an even function of ω and is 0 or positive for all values of ω. 3. Re F(jω) is an odd function of ω and is 0 or negative for all values of ω. 4. Re F(s) = 0 for Re s = 0. Which one of the statements given above is/are correct? A.

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

17. Which of the following statements is incorrect? A.

Ideal voltage source is one B. whose internal conductance is zero

1 only

B. 1 and 4

Ideal voltage source is one C. whose generated voltage is equal to the available terminal voltage

C. 2, 2 and 4 D. 4 only Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D.

15. Which of following is linear and bilateral parameter? A.

Ideal voltage source is one whose internal resistance is zero

Ideal current source is one whose internal conductance is zero

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Resistors

B. Semi conductor diodes

18. If the peak value of output of a half wave rectifier is 100 V, the rms value is

C. Electron tubes

A.

D. Transistor

B. 50 V

Answer: Option A Explanation:

100 V

C. 70.7 V

D. 35.35 V

21. For the network of figure, [z] matrix is

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

19. Assertion (A): is not an LC function. Reason (R): The highest powers of numerator and denominator do not differ by 1. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

A.

B.

C. A is true but R is false D. A is false but R is true Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

20. For a flexible cable, most suitable insulation is A.

magnesium oxide

C.

D.

Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

B. glass fibre 22. A h is the unit of quantity of electricity. C. insulating tape

A.

True

D. polyvinyl chloride

B. False Answer: Option D Answer: Option A Explanation: Explanation: No answer description available for this question. LetNo usanswer discuss.description available for this View Answer Discuss in Forum Workspace Report question. Let us discuss. View Answer Discuss in Forum Workspace Report

23. All network theorems of dc are applicable to ac also with different quantities taken as phasors.

A.

True

No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

24. An ac circuit has two branches in parallel. The impedances of the two branches are equal. Their power factors are 0.8 lagging and 0.8 leading. The overall p.f. is A.

1

27. The resonance frequency is A.

ωr = a

B. ωr = b C. ωr = k D. ωr = ba Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. zero C. about 0.7 lagging D. about 0.7 leading Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

25. In a network A.

28. Maximum power transfer theorem is applicable to circuits with one source only. A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Number of links = Number of branches - number of nodes + 1

B. Number of links = Number of branches - number of nodes 29. Two coupled coils have self inductance L1 and L2. The coefficients of coupling C. Number of links = Number of branches - number of The nodes - 1 inductance is is k. mutual k L1 L2 - 2 D. Number of links = Number of branches - numberA.of nodes Answer: Option A B. k2L1L2 Explanation: No answer description available for this question. Let us C. discuss. kL1L2 kL1LUnder 2 26. A dc voltage source is connected across a series RLCD.circuit, steady state conditions, the applied dc voltage drops entirely across the Answer: Option C A.

R only

B. C only C. L only

Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. R and L Answer: Option B Explanation:

30. Laplace transform method enables us to find the respons

A.

steady state

B. transient state

C. decreasing the number of turns D. increasing core length

Answer: Option A Explanation: answer description available for this D. transient state provided forcing functions do notNo exist question. Let us discuss. Answer: Option C View Answer Discuss in Explanation: Forum Workspace Report No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 31. When analysing two port networks in cascade, it is more convenient to use 34. The dual of quantity charge is A. z parameters A. current B. h parameters B. Voltage C. T parameters C. flux D. y parameters D. dΦ/dt Answer: Option C Answer: Option C Explanation: No answer description available for this question. LetExplanation: us discuss. View Answer Discuss in Forum Workspace Report No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 32. For a transfer function H(s) = P(s)/Q(s), where P(s) and Q(s) are polynomials in s 35. Consider the following statement : If a network has an im the degrees of P(s) is always frequency, the circuit would consist of series A. greater than degree of Q(s) 1. R and C the degree of P(s) and Q(s) are B. 2. R and L equal 3. R, L and C the degree of P(s) is independent Which of the statement are correct? C. of degree of Q(s) A. 1 and 2 the maximum difference in D. B. 1 and 3 degrees of P(s) and Q(s) is 1 C. both steady and transient state

Answer: Option C Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

33. The inductance of a coil can be increased by A.

choosing core material having high relative permeability

C. 1, 2 and 3 D. 2 and 3

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 36. The minimum permissible size of aluminium cable for ligh A.

1.2 sq. mm

B. 1.5 sq. mm C. 2.2 sq. mm

B. decreasing diameter of the former D. 3.5 sq. mm Answer: Option B

Explanation: A. J = σE No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report B. σ = JE

37. Assertion (A): In a parallel circuit having two branches, each branch current may be more than source current. Reason (R): Calculations in ac circuits use rules of complex algebra. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

C. D. J = σE2 Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

40. If a driving point function N(s) = p(s)/q(s), then A.

the degree of p(s) and q(s) may differ by one only

D. A is false but R is true Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

38. Which one of the following parameters does not exist for the two port network shown in the given figure?

A.

B. the degree of p(s) and q(s) may differ by zero only C. the degrees of p(s) and q(s) be equal D. the degrees of p(s) and q(s) must not be equal Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 41. For the circuit of figure, the time constant is

ABCD A.

B. y C. h D. z Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B.

C.

D. 39. Current density J, conductivity σ and electric field E in a conductor are related as

Answer: Option A Explanation:

No answer description available for this question. Let us discuss. transients in circuit 2 will decay View Answer Discuss in Forum Workspace Report A. faster 42. The ratio of active power to apparent power is known as __________ factor. A.

power

B.

transients in circuit 1 will decay faster

C.

transients in both circuits will decay at the same rate

D.

transients in any one may decay faster than in the other

B. load C. form D. demand Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

45. In an idealized half wave rectified system the average an __________ respectively. 43. A pole zero plot of a filter is shown in figure. It is

A.

2Vm/, Vm/2

B. Vm/, Vm/2 C. Vm/, Vm/2 D. Vm., Vm/2 Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspa 46. A function f(t) = k eat is __________ for (a > 0). A. A.

low pass filter

stable

B. unstable

B. high pass filter

C. marginal

C. band pass filter

D. none

D. all pass filter Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

47. The peak factor is the ratio of A.

peak and rms values

B. peak and average values 44. Two RLC series circuit has same damping ratio. Circuit 1 has higher natural frequency as compared to circuit 2. Then

C. rms and average values D. none of the above

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

A.

L/C

B. (L/C)0.5 C. 1/LC D. 2/L/C

48. In attenuation band, β is an odd multiple of . A.

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

49. Which of the following is correct? The circuit shown in the figure.

Answer: Option D Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report 1. A capacitor is considered to be completely charged in __ A.

one

B. three C. five D. eight Answer: Option C Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

2. For an m-derived high pass

filter A. 1. is reciprocal but not symmetrical 2. is not reciprocal but symmetrical 3. both reciprocal and symmetrical 4. neither reciprocal nor symmetrical A.

1, 2 and 3

True

B. False Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

B. 2, 3 and 4 C. 1, 3 and 4 D. 1, 2 and 4 Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

3. Consider the following statements associated with two port networks. 1. Z12 = Z21 2. Y12 = Y21 3. h12 = h21 4. AD - BC = 1 Which one of the statement given above are correct? A.

1, 2, 3

B. 2, 3, 4 50. In a series RLC circuit, the value of resistance for critical C. damping 1, 3, 4 is

D. 1, 2, 4 Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

7. The Kirchoff's laws fail in which of the following circuits? A.

4. Assertion (A): The number of basic loops is equal to number of links. Reason (R): The graph theory helps in choosing independent variables in circuit analysis. A.

Both A and R are true and R is correct explanation of A

B.

Both A and R are true and R is not the correct explanation of A

C. A is true but R is false

Linear circuits

B. Non-linear circuits C. Lumped parameters circuits D. Distributed parameters circuits Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

D. A is false but R is true Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

8. A black box has one of the elements our of R, L, C. when a 220 V a supply is connected the current supplied by source is I. when a 0.1 F capacitor is connected in parallel with the box, the current is 2I. The element is A.

resistance

B. inductance 5. In an R-L-C circuit, v(t) = 20 sin (314 t + 5 /6) and i(t) = 10 sin (314 t + 2/3). The p.f of the circuit is C. 0.1 F capacitance A.

0.5 lead

B. 0.866 lag

D.

not identifiable on the basis of given data

Answer: Option B Explanation: No answer description available for this D. 0.5 lead question. Let us discuss. Answer: Option B View Answer Discuss in Explanation: Forum Workspace Report No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 6. In any network of linear impedances the current flowing at any point equal to algebric sum of 9. In figure, the switch has been in closed currents caused to flow at that point by each of the emf taken separately with all other emfs position for a long time. At t = 0, the reduced to zero. The statement represents. switch is opened. At t = 0+, the current A. KCL C. 0.866 lead

B. Norton's theorem C. Thevenin's theorem D. Superposition theorem

R1 is

Explanation: No answer description available for this question. Let us View Answer Discuss in Forum Workspace Report

12. Norton's theorem reduces a two terminal network to A.

8A

B. 4 A

A.

a constant current source and an impedance is parallel

B.

a constant current source and an impedance in series

C.

a constant voltage source and an impedance in parallel

D.

a constant voltage source and an impedance in series

C. 6 A D. 2 A Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option A Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report 10. The expression for the resonant frequency ω0 in the circuit shown 13. For a two- port reciprocal network, the output open circuit voltage divided by the input current is equal to A. A.

1/LC

B

B. Z12 C. 1/y12

B. D. h12 C. D. none

Answer: Option B Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

Answer: Option B Explanation: No answer description available for this question. Let us discuss. 14. If H(s) is positive real, 1/H(s) View Answer Discuss in Forum Workspace Report 11. The phase difference between them is __________ degrees. A. is positive real A.

15

B. 50 C. 60 D. 105 Answer: Option D

B. is not positive real C. may or may not be positive real must possess some other D. properties also if it is to be positive real Answer: Option D

Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report

View Answer Discuss in Forum Workspace Report

18. A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then the voltage 15. Open-circuit voltage is the potential difference between across two each point resistor when the is impedance between these points is A. half A.

zero B. doubled

B. infinity C. increase by 4 times C. capacitive D. no change D. reactive

Answer: Option D Answer: Option B Explanation: Explanation: No answer description available for this No answer description available for this question. Letquestion. us discuss. Let us discuss. 16. A network has two sources of different frequencies. The Viewonly Answer method Discuss of analysis in which can be used to find current and voltages of different branches Forum is Workspace the use of Report A.

Kirchoff's laws

B. Superposition theorem C. Thevenin's theorem

19. If operator 'a' = 1 ∠120° then (1 + a + a2) = A.

-a

D. Tellegen's theorem

B. -a2 Answer: Option B Explanation: C. 1 No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report D. 0

17. For a series R-L-C circuit tuned at resonant frequency which of the following statements is correct? A.

The voltage across inductance is greater than applied voltage

B.

The voltage across capacitance is greater than applied voltage

The voltage across both C. inductance and capacitance is greater than applied voltage The voltage across both D. inductance and capacitance is less than applied voltage Answer: Option C Explanation: No answer description available for this question. Let us discuss.

Answer: Option D Explanation: No answer description available for this question. Let us discuss. View Answer Discuss in Forum Workspace Report