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Preboard examination, Exams of Civil Engineering

Cavite State University (CSU)Civil Engineering

Preboard examination for civil engineering

Typology: Exams

2020/2021

Uploaded on 09/14/2023

thaised1811
thaised1811 🇵🇭

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Page 1 of 7
REVIEW INNOVATIONS
MANILA – CEBU - DAVAO
PHILIPPINES
CIVIL ENGINEERS Second Preboard Examination
Saturday, September 17, 2022 2:00 p.m. — 6:00 p.m.
-----------------------------------------------------------------------------
HYDRAULICS AND GEOTECHNICAL ENGINEERING SET A
INSTRUCTION: Select the correct answer for each of the following questions.
Mark only one answer for each item by shading the box corresponding to the
letter of your choice on the answer sheet provided. STRICTLY NO ERASURES
ALLOWED.GOOD LUCK.
NOTE: A times B is represented by A × B or A*B. A raised to the power n is
expressed as A^n. All problems are 1 point each.
1. If the absolute pressure in a tank is 140 kPa, determine the pressure
head in mm of mercury. The atmospheric pressure is 100 kPa.
A. 100 C. 300
B. 200 D. 400
2. The 150-mm-diameter container is filled to the top with glycerin (sg =
1.26), and a 50-mm-diameter pipe is inserted within it to a depth of 300
mm. If 0.00075 m^3 of kerosene (sg = 0.814) is then poured into the pipe,
determine the height h, in mm, to which the kerosene rises from the
glycerin.
A. 135 C. 145
B. 125 D. 115
3. A triangular concrete gravity dam is 9 m high. The upstream face is
vertical and the water is flush with the top. Determine the smallest base
width (m) of the dam that will prevent the dam from overturning.
A. 4.11 C. 8.07
B. 6.84 D. 10.35
4. Consider an iceberg to be in the form of a cylinder of arbitrary diameter
and floating in the ocean. If the cylinder extends 2 m above the ocean’s
surface, determine the depth (m) of the cylinder below the surface. The
density of ocean water is ρsw = 1024 kg/m^3, and the density of the ice
is ρi = 935 kg/m^3.
A. 15 C. 21
B. 18 D. 24
5. Oil, sg = 0.90, flows through a horizontal commercial steel pipe 150 mm
in diameter with an average velocity of 3.4 m/s. Calculate the pressure
drop in 61 m of the pipe, in kPa. f = 0.02.
A. 32 C. 52
B. 42 D. 62
6. If the velocity head at a velocity v1 at one point of a pipe is 5.2 m,
what is the velocity head in meters at a point with velocity twice that
of v1?
A. 5.2 C. 20.8
B. 2.6 D. 10.4
pf3
pf4
pf5

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REVIEW INNOVATIONS

MANILA – CEBU - DAVAO

PHILIPPINES

CIVIL ENGINEERS Second Preboard Examination

Saturday, September 17 , 2022 2 : 00 p.m. — 6 :0 0 p.m.

HYDRAULICS AND GEOTECHNICAL ENGINEERING SET A

INSTRUCTION: Select the correct answer for each of the following questions. Mark only one answer for each item by shading the box corresponding to the letter of your choice on the answer sheet provided. STRICTLY NO ERASURES ALLOWED.GOOD LUCK. NOTE: A times B is represented by A × B or A*B. A raised to the power n is expressed as A^n. All problems are 1 point each.

  1. If the absolute pressure in a tank is 140 kPa, determine the pressure head in mm of mercury. The atmospheric pressure is 100 kPa. A. 100 C. 300 B. 200 D. 400
  2. The 150 - mm-diameter container is filled to the top with glycerin (sg = 1.26), and a 50-mm-diameter pipe is inserted within it to a depth of 300 mm. If 0.00075 m^3 of kerosene (sg = 0.814) is then poured into the pipe, determine the height h, in mm, to which the kerosene rises from the glycerin. A. 135 C. 145 B. 125 D. 115
  3. A triangular concrete gravity dam is 9 m high. The upstream face is vertical and the water is flush with the top. Determine the smallest base width (m) of the dam that will prevent the dam from overturning. A. 4.11 C. 8. B. 6.84 D. 10.
  4. Consider an iceberg to be in the form of a cylinder of arbitrary diameter and floating in the ocean. If the cylinder extends 2 m above the ocean’s surface, determine the depth (m) of the cylinder below the surface. The density of ocean water is ρsw = 1024 kg/m^3, and the density of the ice is ρi = 935 kg/m^3. A. 15 C. 21 B. 18 D. 24
  5. Oil, sg = 0.90, flows through a horizontal commercial steel pipe 150 mm in diameter with an average velocity of 3.4 m/s. Calculate the pressure drop in 61 m of the pipe, in kPa. f = 0.02. A. 32 C. 52 B. 42 D. 62
  6. If the velocity head at a velocity v 1 at one point of a pipe is 5.2 m, what is the velocity head in meters at a point with velocity twice that of v 1? A. 5.2 C. 20. B. 2.6 D. 10.

Saturday, September 17 , 2022 2 :00 p.m. — 6 :00 p.m. Page 2

HYDRAULICS AND GEOTECHNICAL ENGINEERING SET A

  1. A woman with a glass of water having a height of 300 mm is inside the elevator with an upward acceleration of 3 m/s^2. Determine the pressure (kPa) at the bottom of the glass. A. 2.11 C. 5. B. 3.84 D. 4.
  2. A barge, weighing 350 kN when empty, is 6 m wide, 15 m long, and 3 m high. Floating upright, evaluate the draft of the barge, in meters, when transporting 3000 bags of cement along a river, each bag having a mass of 40 kg. Assume the specific gravity of the water in the river to be 1.02. A. 1.38 C. 2. B. 2.57 D. 1.
  3. A trapezoidal canal has a bottom width of 4 m and side slopes of 2 horizontal to 1 vertical. When the depth of the flow is 1.2 m, the flow is 30 m^3/sec. The roughness coefficient n = 0.015. Evaluate the slope of the channel using Manning’s formula. A. 0.00195 C. 0. B. 0.00316 D. 0.
  4. A 200 mm by 200 mm by 400 mm block weighs 50 N when fully submerged into water. What is the weight (N) of the block in air? A. 207 C. 157 B. 50 D. 107 Situation 1. Reservoirs A, B and C shown are connected by cast iron pipes where f =0.02. for the properties indicated in the accompanying figure.
  5. Calculate the flow rate in pope A, in m^3/s? A. 0.345 C. 0. B. 0.366 D. 0.
  6. Calculate the flow rate in pope B, in m^3/s? A. 0.069 C. 0. B. 0.269 D. 0.
  7. Calculate the flow rate in pope C, in m^3/s? A. 0.025 C. 0. B. 0.128 D. 0. Situation 2. A pipeline 300 mm in diameter and 5200 m long brings water from a reservoir at elevation 156 m to a redistribution reservoir of a certain community at elevation 102 m. f = 0.02.
  8. What is the rate of flow in liters per second? A. 95.2 C. 123. B. 109.4 D. 137.
  9. What population can be served assuming a per capita consumption of 95 liters per day? A. 96350 C. 175112 B. 112411 D. 205118

A

B

C

El. 106 m El. 66 m 0.6 m 0.3 m 0.4 m 2000 m 2000 m 3000 m El. 76 m

Saturday, September 17 , 2022 2 :00 p.m. — 6 :00 p.m. Page 4

HYDRAULICS AND GEOTECHNICAL ENGINEERING SET A

Situation 6. The depth of water in a lake is 3 m. The soil properties as obtained from soil exploration below the bed of the lake are given in the below. Depth from bed of the lake (m) Type of Soil Void ratio, e Specific Gravity of Solids, G s 0 – 4 Clay 0.9 2. 4 – 9 Sand 0.75 2. 9 – 15 Clay 0.6 2. For a depth of 12 m below the bed level of the lake. Calculate the following pressures.

  1. The total pressure in kPa. A. 290.7 C. 230. B. 320.2 D. 259.
  2. The pore pressure in kPa. A. 147.2 C. 117. B. 176.6 D. 206.
  3. The intergranular pressure in kPa. A. 143.5 C. 173. B. 112.3 D. 82. Situation 7. From the figure below: Assume: 3K 1 = K 2 = 1.5K 3 = 2K 4 and that layer 2 & 3 are of equal height. AB = 6 cm, BC = 10 cm and CD = 8 cm
  4. Find the pressure head at point B A. 19.3 cm C. 16.2 cm B. 24.0 cm D. 12.0 cm
  5. Find the pressure head at point C A. 19.3 C. 16. B. 24.0 D. 12.
  6. Find the rate of flow if K 1 = 3.5 x 10^-2 cm/sec A. 0.11 cm^3 /sec C. 0.08 cm^3 /sec B. 0.15 cm^3 /sec D. 0.18 cm^3 /sec Situation 8. Sheet piles were driver in a river bed as shown in the figure. The trench level within the sheet piles is kept at trench level by pumping. (k = 4 x 10^-7 m/s, γsat = 20 kN/m^3).
  7. Number of flow channels on each sheet pile. A. 3 C. 4 B. 6 D. 8
  8. Rate of seepage in cu.m/s. A. 1.08 x 10 -^6 C. 3.00 x 10 -^7 B. 6.00 x 10 -^7 D. 5.40 x 10 -^7

Saturday, September 17 , 2022 2 :00 p.m. — 6 :00 p.m. Page 5

HYDRAULICS AND GEOTECHNICAL ENGINEERING SET A

  1. Pressure head at point D. A. 2.0 m C. 3.6 m B. 0.5 m D. 0.9 m Situation 9. A stratified soil deposit consists of four layers. The thickness of the second, third and fourth layers are equal to half, one-third and one-fourth, respectively, the thickness of the top layer, while their coefficients of permeability are respectively twice, thrice and four times that of the top layer. Determine:
  2. Equivalent horizontal coefficient of permeability A. 1.46 k 1 C. 1.92 k 1 B. 1.03 k 1 D. 1.32 k 1
  3. Equivalent vertical coefficient of permeability A. 1.03 k 1 C. 1.32 k 1 B. 1.46 k 1 D. 1.92 k 1
  4. Ratio of equivalent coefficient of permeability A. 1.32 C. 1. B. 1.46 D. 1.
  5. The natural moisture content of a soil mass is 11%, while its void ratio is 0.63. Assuming the void ratio to remain unchanged, determine the quantity of water to be added to 4 m^ 3 of this soil in order to double its moisture content. Given that the specific gravity of solids is 2.72. A. 164 kg C. 183 kg B. 656 kg D. 732 kg Situation 10. Details of a cantilever retaining concrete wall are shown in figure, the water table being below the base of the wall. The unit weight of the backfill is 17 kN/m^ 3 and a surcharge pressure of 10 kPa acts on the surface. Characteristic values of the shear strength parameters for the backfill are c = 0 and f = 36°. The coefficient of friction between the base and the foundation soil is 0.51. Assume the unit weight of concrete is 23.5 kN/m^ 3.
  6. Calculate the factor of safety against sliding. A. 1.25 C. 1. B. 1.38 D. 2.
  7. Calculate the righting moment. A. 429 kN-m C. 397 kN-m B. 477 kN-m D. 340 kN-m
  8. Factor of safety against overturning. A. 2.21 C. 2. B. 2.58 D. 3.

Saturday, September 17 , 2022 2 :00 p.m. — 6 :00 p.m. Page 7

HYDRAULICS AND GEOTECHNICAL ENGINEERING SET A

Situation 13. Situation: Two footings rest in a layer of sand 2.7 m thick. The bottoms of the footings are 0.90 m below the ground surface. Under the clay layer is rock. The water table is at a depth of 1.8 m below the ground surface. Footing A is 1.5 m square. e =1.03 Cc = 0.

  1. Compute the stress increase at the center of clay layer assume that the pressure under the footing is spread at an angle 2 vertical to 1 horizontal. A. 34.21 kPa C. 44.63 kPa B. 25.51 kPa D. 56.21 kPa
  2. Determine the size of footing B so that the settlement in the clay layer is the same under footings A and B. A. 3.11 m C. 3.24 m B. 3.98 m D. 3.76 m
  3. Find the settlement under footing A. A. 86 mm C. 101 mm B. 46 mm D. 231 mm ~o0o~ Nothing Follows 450 kN 900 kN g =18 kN/cu m 0.90m 0.90m 0.90m 1.80m SAND CLAY A B