Preboard 2 Geo

CIVIL ENGINEERS LICENSURE EXAM (EERC Preboard - MANILA) OCTOBER 2019 HYDRAULICS AND GEOTECHNICAL ENGINEERING

6.

Compute the coefficient of permeability of the aquifer

INSTRUCTION: Select the correct answer for each of the following

in m/day.

questions. Mark only one answer for each item by shading the

a.

51.82

c.

57.42

box corresponding to the letter of your choice on the answer

b.

65.09

d.

60.27

sheet provided. STRICTLY NO ERASURES ALLOWED. Use pencil no. 1 only.

7.

MULTIPLE CHOICE Situation 1: A wedge of wood having a specific gravity of 0.60 is

8.

Compute the transmissivity of the aquifer in m2/day. a.

1579

c.

1325

b.

1426

d.

1288

At which soil state can the soil be molded into any desired shape without rupture?

pushed into the water by a 2 kN force. The wedge is 1 m wide.

9.

a.

Solid

c.

Semi-Solid

b.

Plastic

d.

Liquid

If water flows in uniformly at the rate of 45 ft 3/s in a rectangular flume with width of 4 feet and a depth of 1.2 feet, what type of flow is it?

1.

Determine the submerged depth of the wedge. a.

1.55 m

c.

1.69 m

b.

1.34 m

d.

1.47 m

10.

a. Supercritical

c. Subcritical

b.

d.

Laminar

Turbulent

Water flows in a trapezoidal channel and running full. If the channel has a discharge of 8 m3/s, find the base

2.

Determine the speed of the wedge when it moves

width for a most efficient section. n =0.012, S = 0.0008.

upward by 150 mm after the 2 kN load is released.

a.

2.02 m

c.

1.64 m

a.

0.48 m/s

c.

0.95 m/s

b.

2.59 m

d.

1.77 m

b.

2.47 m/s

d.

2.61 m/s Situation 3:

3.

What load, in addition to the 2 kN, should be added so

have a Froude Number of 3.16. The channel is

that the wedge will be fully submerged?

5 m in width. The depth of flow is 1 m. If the

a.

2.6 kN

c.

7.1 kN

water undergoes a hydraulic jump:

b.

9.5 kN

d.

4.8 kN 11.

4.

Water is moving in a rectangular channel to

Determine the depth of flow after the jump.

A dam 4 m on top, 18 m at the bottom and 24 m high

a.

4m

c.

3m

has a water 20 m deep acting on its vertical side. What

b.

5m

d.

2m

is the factor of safety against overturning? Assume weight of masonry to be 2400 kg/m3.

12.

Find the Froude number after the jump.

a.

3.12

c.

1.87

a.

0.347

c.

0.395

b.

5.59

d.

3.29

b.

0.475

d.

0.565

Situation 2:

A 300 mm diameter test well penetrates 27m

13.

Compute the velocity after the jump

below the static water table. After 24 hours of

a.

3.12 m/s

c.

3.41 m/s

pumping at 69 liters/sec. the water level in an

b.

2.47 m/s

d.

6.45 m/s

observation well at a distance of 95m from the test well is lowered 0.5m and the other observation well at a distance of 35m from the test well, the drawdown is 1.1m. 5.

5961.6

c.

b.

6523.4 d.

4321.5

A vertical jet of water thru a nozzle supports a load of 150 N. The velocity and diameter of the jet at the nozzle tip are 17.46 m/s and 3 cm respectively. Compute the distance of load from the nozzle tip.

What is the rate of flow in m3/day. a.

14.

5332.8

a.

6m

c.

4m

b.

8m

d.

10 m

ENGR. ERICKNEIL D. REALUYO, MSCE, ME-1. SO, MP

CIVIL ENGINEERS LICENSURE EXAM (EERC Preboard - MANILA) OCTOBER 2019 15.

An old pipe is to be replaced by a new one with the same diameter and length. If the friction factor of the

23.

it weighs 300 N. Find the specific gravity of the stone.

new to the old pipe.

a.

3.214

c.

1.645

b.

2.141

d.

2.875

a.

0.85

c.

1.41

b.

1.22

d.

0.91 24.

Situation 4:

16.

A stone weighs 460 N in air. When submerged in water,

new is 2/3 of the old, compute the ratio of flow of the

A block of wood 0.20 m thick is floating in seawater (s

An open cylindrical tank 30 cm in diameter and

= 1.03). The specific gravity of the wood is 0.65. Find the

80 cm high partially filled with water is rotated

minimum area of the wooden block to support a man

about its vertical axis at a speed of 240 rpm.

weighing 80 kg.

What would be the depth of water if the tank is brought

a.

0.215 m2

c.

1.053 m2

b.

2.150 m

d.

2.310 m2

2

to rest so that no water will be spilled out? a.

0.36 m

c.

0.44 m

b.

0.32 m

d.

0.72 m

25.

An iceberg having a specific gravity of 0.92 is floating on salt water of specific gravity of 1.03. If the volume of ice above the water surface is 1000 m3, what is the total

17.

At what speed would it be rotated so that 1.40 liters of

volume of ice?

water will be spilled out?

a.

9364 m3

c.

10422 m3

b.

8402 m

d.

11789 m3

a.

242.75 rpm

c.

256.30 rpm

b.

245.80 rpm

d.

249.65 rpm 26.

18.

19.

3

A tank with vertical sides, 3 m deep, 1.2 m square is

At what speed should it be rotated so that the pressure

filled to a depth of 2.7 m with water. A cube of wood (s

at the center of the bottom of the tank is zero?

= 0.50) measuring 60 cm on an edge is placed inside

a.

256.73 rpm

c.

248.97 rpm

the container and floats. Find the weight of the volume

b.

258.32 rpm

d.

252.22 rpm

of water displaced.

A container 10 m wide and 10 m long contains water 2

a.

2.64 kN

c.

5.48 kN

b.

3.14 kN

d.

1.06 kN

m high and is accelerating to the right at a rate of 2.45 m/s2. Find the minimum pressure at the base. a.

5.65 kPa

c.

8.45 kPa

b.

7.37 kPa

d.

9.14 kPa

Situation 5: The actual velocity in the contracted section of a jet of liquid flowing from a 2 inches diameter orifice is 28 ft/s under

20.

A 1.25 cm diameter orifice in a vertical wall of a tank

a head of 15 ft.

under a constant head of 5.50 m discharges 0.45 m3 in 9.50 minutes. Find the coefficient of discharge.

21.

27.

0.48

c.

0.56

a.

0.805

c.

0.409

b.

0.62

d.

0.68

b.

0.901

d.

0.706

A wooden block having a specific gravity of 0.60, 40 mm

28.

x 60 mm x 3.5 m long is made to float in water. How should be attached at the bottom to make the wooden block float 300 mm exposed to atmosphere? a.

4.7 kg

c.

3.8 kg

b.

2.9 kg

d.

3.2 kg

29.

A body having a specific gravity of 0.70 floats on a liquid with specific gravity of 0.80. The volume of the body above the liquid surface is what percent of its total volume? a.

87.5%

c.

12.5%

b.

90.0%

d.

10.0%

If the measured discharge is 0.403 ft3/sec, determine the coefficient of contraction.

many kilograms of stone having specific gravity of 3.25

22.

Determine the value of the coefficient of velocity.

a.

30.

a.

0.66

c.

0.56

b.

0.60

d.

0.54

Determine the coefficient of discharge. a.

0.485

c.

0.231

b.

0.387

d.

0.594

A liquid having a specific gravity of 0.788 flows at 3.2 m/s through a 100 – mm diameter pipe line. Assume f = 0.0158. Find the head loss per kilometer of the pipe. a.

82.46 m

c.

65.87 m

b.

78.98 m

d.

99.99 m

ENGR. ERICKNEIL D. REALUYO, MSCE, ME-1. SO, MP

CIVIL ENGINEERS LICENSURE EXAM (EERC Preboard - MANILA) OCTOBER 2019 39. 31.

32.

A block of wood floats in water with 20 cm projecting

A turbine is rated at 600 hp when the flow of water

above the water surface. The same block when placed

through it is 0.61 m3/s. Assuming efficiency of 87%, what

in oil (s = 0.80) floats with 15 cm projecting above the

is the head acting on the turbine?

oil surface. Find the specific gravity of the block.

a.

98.76 m

c.

76.95 m

a.

0.45

c.

0.50

b.

85.97 m

d.

100.23 m

b.

0.64

d.

0.72

Neglecting air resistance, determine to what height a

Situation 7:

A retaining wall 6 m. high is supporting a

vertical jet of water could rise if projected with a velocity

horizontal backfill having a dry unit weight of

of 20 m/sec?

1600 kg/m3. The cohesionless soil has an angle

a.

10.34 m

c.

20.39 m

b.

15.76 m

d.

18.79 m

of friction of 32° and a void ratio of 0.68. 40.

Determine the Rankine active force on the wall.

Situation 6: An orifice 80 mm in diameter was placed 0.96 m

a.

133.67 kN

c.

282.60 kN

above the ground at the vertical side of an

b.

86.76 kN

d.

74.09 kN

upright cylindrical tank 3 m in diameter. When opened, it hits the ground initially 2 m away

41.

from the orifice. The initial flow rate was 0.0161

logging occurs at a depth of 3.5 m. from the ground.

m /sec when water surface was 1.4 m above

a.

81.1 kN

c.

116.3 kN

the orifice.

b.

94.8 kN

d.

111.8 kN

3

33.

34.

Determine the Rankine active force on the wall if water

How long will the jet reach the ground?

42.

Determine the location of the resultant active force from

a.

0.442 sec

c.

0.446 sec

the bottom.

b.

0.431 sec

d.

0.416 sec

a.

1.89

c.

1.74 m

b.

2.08 m

d.

2.19 m

Find the coefficient of velocity. a.

0.927

c.

0.735

Situation 8: The laboratory compaction test of a certain type of

b.

0.912

d.

0.863

soil gives a maximum dry density of 1.486 Mg/m3 with an optimum moisture content of

35.

Determine the coefficient of discharge.

12.5%. The following are the results of a field

a.

0.736

c.

0.612

unit weight determination test using sand cone

b.

0.546

d.

0.805

method. Volume of soil excavated from the hole = 0.001337 m3

36.

Weight of soil from the hole when wet = 2220 g

A rectangular channel 6.2 m by 1.2 m deep is lined with

Weight of dry soil = 1890 g

a smooth stone, well laid and has a hydraulic slope of 0.001. Use n = 0.013. What is the capacity of the channel?

37.

38.

43.

Determine the field unit weight of soil.

a.

14.32 m /s

c.

15.46 m /s

a.

1.66 g/cc

c.

1.78 g/cc

b.

16.43 m3/s

d.

11.29 m3/s

b.

1.43 g/cc

d.

1.27 g/cc

3

3

What size of new cast iron pipe shall be used to carry

44.

Determine the in situ moisture content of soil.

0.284 cubic meters per second with a head loss of 10.56

a.

20.10 %

c.

17.46 %

m per kilometer? n =0.019.

b.

14.56%

d.

11.26 %

a.

649 mm

c.

498 mm

b.

304 mm

d.

513 mm

45.

Determine the relative compaction. a.

93.90 %

c.

98.20 %

1.8 m wide rectangular canal carries a flow of 2.4 m3/s.

b.

95.15 %

d.

97.33 %

What is the critical depth?

b.

d.

0.00506

a.

0.433 m

c.

0.566 m

b.

0.667 m

d.

0.812 m

0.00321

ENGR. ERICKNEIL D. REALUYO, MSCE, ME-1. SO, MP

CIVIL ENGINEERS LICENSURE EXAM (EERC Preboard - MANILA) OCTOBER 2019 Situation 9:

A wooden storage vat full of oil sp. gr. = 0.80 is in the form of a frustum of a cone, 2 m. diameter at the top , 4 m. diameter at the bottom and 3 m high. It is provided with 2 steel hoops, one at the top and one at the bottom.

46.

Compute the hydrostatic force on the side of the container.

47.

a.

171.74 kN

c.

177.47 kN

b.

111.47 kN

d.

117.74 kN

Compute the location of the hydrostatic force measured from the bottom of the tank.

48.

a.

0.90 m

c.

0.85 m

b.

1.17 m

d.

1.33 m

Compute the force in the bottom hoop. a.

41.21 kN

c.

58.87 kN

b.

85.87 kN

d.

42.11 kN

Situation 10: A soil has an unconfined compressive strength of 120 kpa. In a triaxial compression test, a specimen of the same soil when subjected to a chamber pressure of 40 kpa failed at an additional stress of 160 kpa. 49.

Determine the cohesion of the soil. a.

37.50 kpa

b.

42.42 kpa

c.

45.62 kpa d.

48.01

kpa 50.

Determine the angle of internal friction. a.

14.90°

c.

17.88°

b.

15.22°

d.

19.47°

ENGR. ERICKNEIL D. REALUYO, MSCE, ME-1. SO, MP