Ec-i Multiple Choice Questions

1. The relationship between input and output voltage of a common emitter amplifier is Always unity Always positive Always negative Less than unity

2. The voltage gain of a common amplifier is Always equal Always positive Always negative None of the above

3. The voltage gain of a common base amplifier is Always equal Always positive Always negative None of the above

4. In an amplifier the output varies Linearly for any amount of input amplitude Linearly for restricted range of input amplitude Nonlinearly for any amount of input amplitude All the above

5. the h parameter of a BJT are called

Small signal parameter Large signal parameter T-parameter Z-parameter

6. the configuration that offers highest input resistance and the lowest output resistance is CE CB CC All the above

7. the configuration that offers highest input resistance and the lowest output resistance and lowest output resistance CE CB CC All the above 8.the configuration that offers highest current amplification ratio but lowest voltage amplification is

CE CB CC All the above 9. the configuration that offers highest power gain is CE CB

CC All the above 10.the important consideration in cascading of different configuration of BJT amplifiers Matching of impedances Matching of current gain Matching of load 11. the most popular general purpose amplifier configuration is CE CB CC All the above 12. the CE amplifier configuration is preferred over others because if offers Highest current gain, voltage and power gains Medium current gain, voltage and power gains Lowest current gain, voltage and power gains None of the above 13. the configuration that behaves as a constant current source is CE CB CC All the above 14.the two stage CC amplifier configuration provides approximately Unity voltage gain 50 voltage gain Infinite voltage gain

Zero 15. The buffer stage can employ the configuration CE CB CC All the above 16.the stage which avoids loading the previous stage is called buffer amplifier. what is the other name? CE CB CC All the above 17. The prime importance in designing a circuit is voltage amplification. Which configuration is preferred for such case CE CB CC All the above 18. the gain bandwidth of an amplifier is Always constant Always variable Always zero Always unity 19.the gain of an amplifier reduces by a factor of 10, the bandwidth Remains constant Increased by the same factor Decreased by the same factor

None of the above

20. the effective bandwidth of identically cascaded stages Decreases Increases Remains constant Unity 21. the bandwidth of an amplifier is approximately Proportional to its upper 3 dB frequency Inversely proportional to its upper 3 dB frequency Product of its 3 dB frequencies None of the above 22.the bootstrap amplifier is associated with High impedance Low impedance Zero impedance None of these 23. the darlington pair is characterized with Very large output impedance Very large input impedance Very low input resistance None of these 24. the output impedance of the darlington pair amplifier is Very large Very low

Zero Unity 25. the current gain of darlington pair is approximately β β2 β/(1+ β) 1/ β 26. At half power frequencies, an amplifier voltage gain is lowered by 6 dB 3 dB 2 dB 0.5 dB 27. Compared to a CB amplifier, the CE amplifier has Lower input resistance Lower current amplification Higher output resistance Higher current amplification 28. one of the effects of negative feedback in amplifier is to Increase the noise Decrease the bandwidth Increase the harmonic distortion Decrease the harmonic distortion 29. the h parameters of a BJT are Dependent on RL Dependent on IQ

Independent on ICQ Constant 30. In an amplifier the output varies Linearly for any amount of input amplitude Linearly restricted range of input amplitude Non linearly for any amount of input amplitude None of the above

31. the voltage gain of CB amplifier configuration has phase shift of 180 90 360 45 32. the buffer stage can employ the configuration CE CB CC All the above 33. the lower cut-off frequency is the frequency where the midband gain goes down towards low frequency region by 3dB 10dB 6dB 5dB 34. the lower cut-off frequency is designed as F1

F0 F2 F2-f1 35. the lower cut-off frequency in BJT amplifier is dominated by Emitter bypassed capacitor Input coupling capacitor Output coupling capacitor None of the above 36.the bypass capacitor in BJT