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A 1. tank is filled with seawater to a depth of 12 ft. If the specific gravity of seawater is 1.03 and the atmospheric pressure at this location is 14.8 psi, the absolute pressure (psi) at the bottom of the tank is most nearly A. 5.4 B. 20.2 C. 26.8 D. 27.2
2. An open tank contains brine to a depth of 2 m and a 3-m layer of oil on top of the brine. Density of brine is 1,030 kg/m3 and the density of oil is 880 kg/m3. The gage pressure (kPa) at the bottom of the tank is most nearly A. 4.7 B. 20.2 C. 25.6 D. 46.1
3. The figure shows two cylinders of diameter D and 2D, connected to each other and containing an incompressible fluid. The two cylinders are fitted with leak-proof pistons of weight W1 and W2 as shown. Which of the following is a correct expression?
A. B. C. D.
W2 = W1/2 W2 = W1 W2 = 2 W1 W2 = 4 W1
4. The figure shows the relationship between shear stress and velocity gradient for two fluids, A and B. Which of the following is a true statement?
A. B. C. D.
Absolute viscosity of A is greater than that of B Absolute viscosity of A is less than that of B Kinematic viscosity of A is greater than that of B Kinematic viscosity of A is less than that of B
5. A flat plate is sliding at a constant velocity of 5 m/s on a large horizontal table. A thin layer of oil (of absolute viscosity = 0.40 N-s/m2) separates the plat from the table. To limit the shear stress in the oil layer to 1 kPa, the thickness of the oil film (mm) should be most nearly A. 0.2 B. 1.6 C. 2.0 D. 3.5
6. A 2-in. diameter shaft is supported by two sleeves, each of length = 2 in. as shown. The internal diameter of the sleeves is 2.1 in. The radial space between the shaft and the sleeves is filled with an oil of viscosity = 8x10-3 lb-s/ft2. If the shaft is rotated at a speed of 600 rpm, the viscous torque (ft-lb) on the shaft is most nearly A. 0.15 B. 0.64 C. 3.20 D. 6.40
7. A 2-in. diameter cylinder is floating vertically in seawater with 75% of its volume submerged. If the specific gravity of seawater is 1.03, the specific weight (lb/cu ft) of the cylinder is most nearly A. 48.2 B. 64.2 C. 83.2 D. 85.7
8. A clean glass tube is to be selected in the design of a manometer to measure the pressure of kerosene. Specific gravity of kerosene = 0.82 and surface tension of kerosene = 0.025 N/m. If the capillary rise is to be limited to 1 mm, the smallest diameter (cm) of the glass tube should be most nearly A. 1.25 B. 1.50 C. 1.75 D. 2.00
9. An object weighs 275 N when fully immersed in water and 325 N when fully immersed in oil of specific gravity 0.9. The volume of the object (m3) is most nearly A. 0.02 B. 0.05 C. 0.20 D. 0.50
10. A block of volume V and specific gravity, SG, is anchored by a light cable to the bottom of a lake as shown. If the specific weight of the water in the lake is gw, the tension, T, in the cable is given by A. B. C. D.
11. When a uniform flat plate is placed horizontally at a depth of h as shown in Figure 1, the magnitude of the force exerted by the fluid on the plate is 20 kN. When this plate is tilted about its center of gravity through 30 as shown in Figure 2, the magnitude of the force (kN) exerted by the fluid on the plate is most nearly
A. B. C. D.
20 sin 30 20 cos 30 20 tan 30 20
12. The figure shows an L-shaped gate ABC hinged at B. Ignoring the weight of the gate, the value of h (m) when the gate is about to open is most nearly
A. B. C. D.
2.0 2.5 3.0 3.5
13. The figure shows a gate made of a uniform plate of height 4 m and width 1 m, hinged about it a horizontal axis through its center of gravity, G. Depth of water on the upstream side of the plate, h is 3 m. The magnitude of the minimum force (kN) that must be applied at A to keep the gate in the vertical position is most nearly
A. B. C. D.
22 26 41 66
14. The figure shows the cross section of a dam. Assume the specific weight of water as 62.4 lb/cu ft. Considering unit width of the dam, the maximum moment of the hydraulic force on the dam about point P (ft-lb) is most nearly
A. B. C. D.
0.8 x 106 1.3 x 106 2.6 x 106 3.9 x 106
15. The figure shows two chambers A and B, where two manometers are being used to measure the pressure. The manometeric fluid is the same in both manometers, with a specific gravity of 1.4. When ha = 6 cm and hb = 4 cm, the gage pressure in chamber A (kPa) is most nearly
A. B. C. D.
0.98 1.37 98 137
16. A manometer is being used as shown to measure the pressure in a pressurized tank.
The tank is partially filled to a depth of 25 cm with a fluid of specific gravity (SG) = 0.78. The specific gravity (SG) of the manometric gage fluid is 3.5. The gage pressure in the headspace (kPa) when h = 8 cm is most nearly A. 0.02 B. 0.22 C. 2.21 D. 22.15
17. An inclined-tube manometer is being used as shown to measure the pressure in a pressurized tank. The tank is partially filled to a depth of 20 cm with a fluid of specific gravity = 0.78. The specific gravity of the manometric gage fluid is 3.5. The gage pressure in the headspace (kPa) when h = 8 cm is most nearly
A. B. C. D.
0.3 0.9 1.2 1.8
18. For a body partially submerged in a fluid and at equilibrium, which of the following is a true statement? A. The weight of the body is equal to the weight of the volume of fluid displaced B. The weight of the body is less than the weight of the volume of fluid displaced C. The weight of the body is greater than the weight of the volume of fluid displaced D. The specific gravity of the body is greater than the specific gravity of the fluid
19. An open separation tank contains brine to a depth of 2 m and a 3-m layer of oil on top of the brine. A uniform sphere is floating with at the brine-oil interface with 80% of its volume submerged in brine. Density of brine is 1,030 kg/m3 and the density of
oil is 880 kg/m3. The density of the sphere (kg/m3) is most nearly A. 825 B. 910 C. 955 D. 1,000
20. At a certain section in a pipeline, a reducer is used to reduce the diameter from 2D gradually to diameter D. When an incompressible fluid flows through this pipeline, the velocity is U1 in the first section and U2 in the second section. Which of the following is a true conclusion? A. U2 = 4U1 B. U2 = 2U1 C. U2 = U1/2 D. U2 = U1/4
21. When a Newtonian fluid flows under steady, laminar condition through a circular pipe of constant diameter, which of the following is NOT a correct conclusion? A. The shear stress at the centerline of the pipe is zero B. The maximum velocity at a section is twice the average velocity at that section C. The velocity will decrease along the length of the pipe D. The velocity gradient at the centerline of the pipe is zero
22. A Newtonian fluid flows under steady, laminar conditions through a circular pipe of diameter 0.16 m at a volumetric rate of 0.05 m3/s. Under these conditions, the maximum local velocity (m/s) at a section is most nearly A. 2.0 B. 2.5 C. 3.0 D. 5.0
23. A 5-cm diameter pipeline is delivering water from a storage tank to an open canal. The water level in the storage tank can be assumed to be at a constant height of 12 m above the discharge point. Ignoring all losses, the discharge (m3/min) under these conditions is most nearly A. 0.03 B. 1.80 C. 7.35
D.
15.34
24. A 5-cm diameter pipeline is delivering water from a storage tank to an open canal. The water level in the storage tank can be assumed to be at a constant height of 12 m above the discharge point. Ignoring all losses, the Reynolds Number in the pipeline under these conditions is most nearly A. 8.6 x 104 B. 8.6 x 105 C. 8.6 x 106 D. 8.6 x 107
25. The figure shows a horizontal pipeline with a sudden enlargement. The energy grade line and the hydraulic grade line under a certain flow of an incompressible fluid are also shown. The ratio of the diameter downstream to the diameter upstream of the enlargement is most nearly
A. B. C. D.
1.26 1.50 1.68 2.50
26. The figure shows a horizontal pipeline with a sudden enlargement. The energy grade line and the hydraulic grade line under a certain flow of an incompressible fluid of specific weight 10 kN/m3 are also shown. The pressure change due to the enlargement is most nearly
A. B. C. D.
an increase of 3 kPa a decrease of 3 kPa an increase of 30 kPa a decrease of 30 kPa
27. The figure shows a horizontal pipeline with a sudden enlargement. The energy grade line and the hydraulic grade line under a certain flow of an incompressible fluid of specific weight 10 kN/m3 are also shown. The pressure change due to the enlargement is most nearly
A. B. C. D.
a decrease of 27 kPa an increase of 27 kPa a decrease of 30 kPa an increase of 30 kPa
28. The figure shows a 10-cm diameter, horizontal pipeline with two piezometers installed 3 m apart. Under laminar flow of lubricating oil (specific gravity = 0.92 and viscosity = 3.8x10-1 Pa-s), the difference in piezometer readings is 12 cm. The flow rate (m3/min) under the above conditions is most nearly
A. B. C. D.
0.02 0.09 0.14 0.21
29. When fluid flow is characterized as fully turbulent, which of the following is a true statement? A. Friction factor will increase with increase of Reynolds Number B. Friction factor will decrease with increase of Reynolds Number C. Friction factor is independent of Reynolds Number D. Friction factor is independent of relative roughness
30. The figure shows the energy grade line when lubricating oil (specific gravity = 0.92 and viscosity = 3.8x10-1 Pa-s) is flowing under laminar conditions through a horizontal pipe. If the flow rate is 0.15 m3/min, the diameter of the pipe (cm) is most nearly
A. B. C. D.
8 10 12 15
31. Ethyl alcohol (specific gravity = 0.79 and viscosity = 1.19x10-3 Pa-s) is flowing
through a 25-cm diameter, horizontal pipeline. When the flow rate is 0.5 m3/min, the Reynolds Number is most nearly A. 28,158 B. 31,424 C. 35,597 D. 42,632
32. Considering the flow of an incompressible fluid through a horizontal pipe, which of the following is a correct statement? A. The energy grade line is always parallel to the centerline of the pipeline B. The energy grade line is always above the hydraulic grade line C. The energy grade line is always horizontal D. The energy grade line is always parallel to the hydraulic grade line
33. The schematic of a pumping system to pump water from a canal to an overhead storage tank is shown. At the design pumping rate of 0.5 m3/min, the total head loss of the system is 10% of the total static head. The power added by the pump (kW) is most nearly
A. B. C. D.
1.0 1.5 2.0 3.0
34. The schematic of a pumping system to pump water from a canal to an overhead storage tank is shown. The total head loss of the system is to be 10% of the total static head. If the pump is powered by a 5 kW motor at an efficiency of 85%, the pumping rate (m3/min) is most nearly
A. B. C. D.
0.2 0.6 1.0 2.0
35. A 20-cm in diameter pipeline with a relative roughness of 0.01 has a total length of 45 m. When water is pumped through it at a rate of 5 m3/min, the major head loss (m) is most nearly A. 3 B. 10 C. 15 D. 20
36. A hydropower turbine fed with water from a reservoir is shown. The total length of the pipe line is 100 m, with a diameter of 0.5 m. Assuming the friction factor to be 0.03 at a flow rate of 0.5 m3/s, and ignoring minor losses, the power generation potential of this system (kW) is most nearly
A. B. C.
80 100 140
D.
160
37. The stagnation pressure at a point in a pipeline of diameter D carrying an incompressible fluid is ps while the static pressure is p. The density of the fluid is and specific its weight, , Which of the following is a correct expression for the flow rate at this point? A. B. C. D.
38. Figure shows a partition maintaining constant water levels on the two sides. The discharge (m3/day) through a 2-cm diameter orifice (coefficient of contraction 0.83) located as shown is most nearly
A. B. C. D.
70 100 150 180
39. Consider the free jet of an incompressible fluid flowing through an orifice fitted to a constant level tank as shown. Ignoring all losses, which of the following is a correct statement about the magnitude of the initial velocity U of the jet?
A. B. C. D.
U is directly proportional to the orifice diameter U is inversely proportional to the fluid's density U is proportional to the square root of the depth h U is proportional to the square of the depth h
40. A 1:12 scale model is to be built to study the flow over a spillway. The flow rate in the prototype 180 m3/s. The flow rate in the model (m3/s) should be most nearly A. 0.36 B. 1.25 C. 8.25 D. 15.0
41. In the study of aerodynamic drag on a stationary body, an appropriate nondimensional grouping has been found to be where, P is the power lost, is the density of the fluid, A is a typical area, and U is the velocity of the fluid. In laboratory tests with a 1:10 scale model at 25C, the power lost was measured as 5 W when the air velocity was 0.5 m/s. The power lost in the prototype (kW) at 25C when the air velocity is 2 m/s will be most nearly A. 2.0 B. 3.2 C. 12.0 D. 32.0
42. Which of the following is a non-dimensional grouping where, F is a force; is the density; A is the area; and U is a velocity? A.
B. C. D.
43. A 0.3-m diameter pipeline terminates in a nozzle of outlet diameter = 0.15 m. When water flows through this pipe at a rate of 0.25 m3/s, the force required to hold the pipe (N) is most nearly A. 660 B. 1,320 C. 2,650 D. 5,300
44. A 0.3-m diameter pipeline terminates in a nozzle of outlet diameter = 0.15 m. The free jet from the nozzle is deflected through 90 by a flat plat as shown. When water flows through this pipe at a rate of 0.25 m3/s, the force required to hold the plat (N) is most nearly
A. B. C. D.
880 1,760 2,640 3,530
45. A pipeline terminates in a nozzle of outlet diameter = 0.15 m. The free jet from the nozzle is deflected through 120 by a vane as shown. Water flow rate through this pipe is 0.25 m3/s. Ignoring friction, the force exerted by the jet on the vane (N) is most nearly
A. B. C. D.
5,295 3,530 1,775 875
46. An open water tank has an orifice of diameter 4 cm fitted on its side, 3 m below the free surface. The tank is mounted on frictionless wheels as shown. Ignoring all friction effects, the force (N) necessary to keep the tank at rest is most nearly
A. B. C. D.
42 740 420 740
47. The following data are available for a pumping system: Fluid water Static suction lift 3m Static delivery head 32 m Total dynamic head 5 m Pumping rate 0.5 m3/s The power added by the pump (kW) is most nearly A. 25 B. 185 C. 200 D. 300
48. The following data are available for a pumping system: Fluid water Static suction lift 3m Static delivery head 35 m Suction side dynamic head 1 m Delivery side dynamic head 6 m Motor rating 30 kW Efficiency 80% The pumping rate (m3/min) under the above conditions is most nearly A. 2.6 B. 3.3 C. 4.0 D. 5.6
49. The head-vs-capacity curves for two centrifugal pumps A and B are shown below:
Which of the following is a correct statement at a flow rate of 600 ft3/min? A. Water horse-power of Pump A is 34 HP B. Water horse-power of Pump B is 34 HP C. Water horse-power of Pump A is 40 HP D. Water horse-power of Pump B is 60 HP
5 The head-vs-flow rate and efficiency-vs.-flow rate curves for a centrifugal pump 0. pumping water are shown below:
The horse-power (HP) required by this pump at a flow rate of 700 ft3/min is most nearly A. B. C. D. 22 26 29 31
51. The figure below shows the pump curve, the system curve, and the efficiency curve for a system pumping water. The brake horse-power (HP) required to run this pump under the condition shown is most nearly
A. B. C.
35 40 55
D.
65
52. The figure below shows a branched pipe network. A pressure gage just upstream of A reads 60 psi and a pressure gage just downstream of D reads 54 psi. The flow rates, diameters, the friction factors, and the lengths of the two branches are as follows: Branch ABD Branch ACD Flow rate Q 2Q Diameter D D Length L L
Which of the following is a true conclusion? A. Pressure drop in branch ACD = 4 psi B. Pressure drop in branch ABD = 2 psi C. Pressure drop in branch ACD = Pressure drop in branch ABD = 6 psi D. Pressure drop in branch ACD = Pressure drop in branch ABD = 3 psi
53. The figure below shows a branched pipe network. The flow rates, diameters, the friction factors, and the lengths of the two branches are as follows: Branch ABD Branch ACD Flow rate Q 2Q Diameter D D Length L L Friction factor f1 f2
Which of the following is a true conclusion? A. f1 = 2f2 B. f1 = 4f2 C. f1 = f2 D. f1 = f2/2
54. A channel of rectangular cross section and width 4 m is carrying a discharge of 2 m3/
s at a uniform depth of 1.5 m. If the Mannings n for the channel is 0.012, the slope (%) of the channel bed is most nearly A. 0.001 B. 0.002 C. 0.003 D. 0.004
55. A circular sewer is of diameter 2 m. Under full flow without surcharge, the velocity of flow is 0.8 m/s. Assuming the Mannings n to be a constant, the velocity of flow (m/s) when the sewer is flowing half full will be most nearly A. 0.2 B. 0.4 C. 0.8 D. 1.6
56. A circular sewer is of diameter 2 m. Under full flow without surcharge, the velocity of flow is 0.8 m/s. Assuming the Mannings n to be a constant, the flow rate (m3/s) when the sewer is flowing half full will be most nearly A. 0.25 B. 0.63 C. 1.26 D. 2.52
57. When a pitot tube is placed in an open channel as shown. When the pitometer reads 11.5 cm, the velocity (m/s) at the point P is most nearly A. 1.5 B. 3.3 C. 4.8 D. 5.5
58. Under laminar flow conditions, the pressure drop per unit length at a given flow rate, Q, is A. proportional to D4 B. proportional to D2 C. proportional to D1/2 D. proportional to D1/4
59. Crude oil is flowing through a pipe of diameter 1.25 m diameter and relative roughness 0.002 at a Reynolds Number of 2x104. Specific gravity of the oil is 0.84 viscosity of the oil is 0.4 N-s/m2. The head loss per 100 m (m) of this pipe is most nearly A. 5.3 B. 7.1 C. 9.2 D. 11.6
60. Crude oil of specific gravity 0.82 is flowing at a rate of 10 m3/s through a pipe of diameter 1.25 m at a friction factor of 0.02. The head loss (m) due to viscous effects over 100 m of the pipe is most nearly A. 0.55 B. 2.15 C. 4.35 D. 5.40
61. Crude oil of specific gravity 0.82 and viscosity of 0.4 N-s/m2 is flowing at a rate of 10 m3/s through a pipe of diameter 1.25 m and relative roughness = 0.002. The head loss (m) due to viscous effect over 50 m of the pipe is most nearly A. 4.0 B. 7.0 C. 9.0 D. 12.0
62. The figure shows a system for pumping water from a canal to an overhead tank. The pipe line is 0.1 m in diameter and has a total length of the pipeline is 60 m. When the flow velocity is 3 m/s, the friction factor is 0.02. Ignoring minor losses, the head added by the pump (m) under these confitions is most nearly
A.
40.0
B. C. D.
45.5 65.5 105.5
63. The coefficient of drag on an automobile of frontal area A is CD. The power required to overcome drag force when the automobile is traveling at a speed of U in still air of density ? is given by A. B. C. D.
64. The figure shows a system for pumping water from a canal to an overhead tank. At a flow rate of 10 m3/s, the major head loss in the system is 15 m and the minor head loss is 4 m. Pump curves for four models of pumps are also shown.
A. B. C. D.
Model A Model B Model C Model D
65. An impulse turbine is to be used at a hydroelectric power plant. The nozzle diameter is 25 cm. If the water flow rate is 5 m3/s, the maximum power (MW) that can be produced by this turbine is most nearly A. 2 B. 6 C. 12 D. 26
66. The hydraulic diameter of a circualr sewer flowing half-full is equal to A. half its diameter B. its diameter C. double its diameter D. times its diameter
67. The drag coefficient for a car with a frontal area of 28 ft2 is 0.32. Assuming the density of air to be 2.4x10-3 slugs/ft3, the drag force (lb) on this car when driven at 60 mph against a head wind of 20 mph is most nearly A. 37 B. 83 C. 148 D. 185
68. The drag coefficient for a car with a frontal area of 26 ft2 is being measured in a 8 ft x 8ft wind tunnel. The density of air under the test conditions is 2.4x10-3 slugs/ft3, When the air flow rate is, 500,000 ft3/min, the drag force on the car was measured to be 170 lb. The drag coefficient under the test conditions is most nearly A. 0.28 B. 0.30 C. 0.32 D. 0.34
69. A manometer is connected across the tapering section of a pipeline as shown. The specific gravity of the manometric fluid is 1.8 and the specific gravity of the fluid flowing through the pipe is 0.72. When the velocity at section 1-1 is 3 m/s, the manometric deflection, h = 6 cm. Ignoring all losses, the velocity (m/s) at section 2-2 under the above conditions is most nearly A. 2.6 B. 3.5 C. 5.2 D. 8.6
70. The relative roughness of a new pipeline is 0.002. The flow is such that the Reynolds Number is 20,000. If the relative roughness increases to 0.006, and the Reynolds Number remains the same, which of the following is most likely? A. Friction factor will decrease B. Friction factor will increase C. Friction factor will remain the same D. Head loss will remain the same
71. The figure shows a reservior A connected to another reservior B by a pipeline. The elevations in A and B can be assumed to remain constant at the levels shown.
The total head loss of the system
A. B. C. D.
is equal to 60 m is equal to 65 m is equal to 80 m can not be determined with the available data
7 The figure shows a reservior A connected to another reservior B by a pipeline. The elevations 2. in A and B can be assumed to remain constant at the levels shown. A pump/turbine is installed in the pipeline that can function either as a turbine producing power when water flows from A to B; or as a pump to pump water from B to A. When functioning as a turbine at a certain flow rate, the head removed by the turbine is 70 m. When functioning as a pump, the head (m) that should be added to pump water from B to A is most nearly
A. B. C. D.
60 70 80 90
7 The velocity of sound, c, in an ideal gas can be found from: where, k = Cp/Cv, R is the gas cons 3. and T is the absolute temperature. Which of the following will be an alternate form of the above expressio where p is the pressure, v is the specific volume; and is the density? A. B. C. D.
7 Air is flowing through a duct at a velocity of 500 ft/s at 70F. Use the following data: 4. Specific heat of air at constant pressure= 6,000 ft-lb/slug-R Specific heat of air at constant volume= 4,285 ft-lb/slug-R Gas Constant= 1,715 ft2/s2-R Assuming air to be an ideal gas, the Mach Number under the above conditions is most nearly A. 0.37 B. 0.44 C. 1.32 D. 2.25
7 Air is flowing through a 2 ft x 2 ft duct at a rate of 2,000 ft3/s at 70F. The following data are available: 5. Specific heat of air at constant pressure= 6,000 ft-lb/slug-R Specific heat of air at constant volume= 4,285 ft-lb/slug-R Gas Constant= 1,715 ft2/s2-R Assuming air to be an ideal gas, the Mach Number under the above conditions is most nearly A. 0.37 B. 0.44 C. 1.32 D. 2.25

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WVU - MAE EE IEN - mae ee ien

1. A tank is filled with seawater to a depth of 12 ft. If the specific gravity of seawater is 1.03 and the atmospheric pressure at this location is 14.8 psi, the absolute pressure (psi) at the bottom of the tank is most nearly A. 5.4 B. 20.2 C. 26.8

WVU - MAE EE IEN - mae ee ien

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