PIPE Elements (Chapter 12: Fluid Machineries)

1. In case of axial flow compressors for
   minimum fluid friction and blade tip
   clearance losses, the blades of an axial
   flow compressor are designed for
   A. 80% reaction
   B. 85% reaction
   C. 60% reaction
   D. 53% reaction

D. 53% reaction

2. Centrifugal blowers can supply.
   A. Large volumes of air at low pressures
   B. Small volumes of air at high pressures
   C. Large volumes of air at high pressures
   D. Small volumes of air at low pressures

A. Large volumes of air at low pressures

3. Which of the following is a safety device
   on a compressor?
   A. Relief valve
   B. Strainer
   C. Over speed shut down
   D. Over pressure shut down

A. Relief valve

4. For a six compression of air set, the
   minimum work conditions are:
   A. Pressure rise per stage will be equal
   B. Work done in successive stages will be in
   geometrical progression
   C. Cylinder volumes will be same
   D. Temperature rise in the cylinders will be
   the same

D. Temperature rise in the cylinders will be
the same

5. In air compressor performance curve a
   surge line represents what?
   A. Limit of compressor efficiency
   B. Limit of compressor discharge
   C. Limit of stable operation
   D. Lower critical speed of shaft

C. Limit of stable operation

6. Which of the following is a displacement
   compressor?
   A. Reciprocating air compressor
   B. Vane blower
   C. Centrifugal blower
   D. Axial flow compressors

B. Vane blower

7. Stalling of the blades of axial flow
   compressor is:
   A. An unsteady periodic and reversal of
   flow
   B. The fixed mass flow rate irrespective of
   pressure ratio
   C. The reduction in lift force at higher angle
   of incidence
   D. All of the above

C. The reduction in lift force at higher angle
of incidence

8. Surging is
   A. An unsteady, periodic and reversal of flow
   in the compressor
   B. The fixed mass flow rate irrespective of
   pressure ratio
   C. The reduction in lift force at higher angle
   of incidence
   D. None of the above

A. An unsteady, periodic and reversal of flow
in the compressor

9. In an axial flow compressor, the pressure
   rise takes place in:
   A. Fixed blades only
   B. Moving blades only
   C. Both fixed and moving blades
   D. None of the above

C. Both fixed and moving blades

10. An axial flow compressor is suitable for:
    A. High volume flow rates with small pressure rise
    B. Low volume flow rates with low pressure rise
    C. High volume flow rates with high pressure rise
    D. Low volume flow rates with high pressure rise

A. High volume flow rates with small pressure rise

11. Which of the following is a positive displacement rotary compressor?
    A. Roots blower
    B. Centrifugal compressor
    C. Axial flow compressor
    D. None of the above

A. Roots blower

12. A compressor whose compression is achieved in one stage only is known as:
    A. single stage compressor
    B. multi stage compressor
    C. dual stage compressor
    D. two stage compressor

A. single stage compressor

13. Which of the following is an advantage of a reciprocating compressor over a centrifugal compressor?
    A. Reduced noise
    B. Easier maintenance
    C. Adaptable to high volume of flow
    D. Adaptable to high pressures

D. Adaptable to high pressures

14. An ideal turbine is one that has:
    A. High velocity of flow
    B. High head
    C. Low power output
    D. High efficiency

D. High efficiency

15. Which of the following is NOT a type of turbine?
    A. Impulse
    B. Reaction
    C. Pelton wheel
    D. None of the above

D. None of the above

16. Which of the following is a reaction turbine?
    A. Pelton
    B. Francis
    C. Cross flow
    D. None of the above

B. Francis

17. Francis turbine is a/an
    A. High head mixed flow turbine
    B. Impulse turbine, inward flow
    C. Reaction turbine, outward flow
    D. Low head axial flow turbine

A. High head mixed flow turbine

18. Kaplan turbine is a/an
    A. High head mixed flow turbine
    B. Impulse turbine, inward flow
    C. Reaction turbine, outward flow
    D. Low head axial flow turbine

D. Low head axial flow turbine

19. A device used for raising fluids from a lower to higher level.
    A. Compressor
    B. Pump
    C. Turbine
    D. Blowers

B. Pump

20. When a pump is operating at a vacuum of 4 in Hg, which of the following is not correct?
    A. The pressure is 25.92 in Hg
    B. The pressure is 12.75 psi
    C. The pressure is 1794 psf
    D. The pressure is 9.87 psia

B. The pressure is 12.75 psi

21. What is the pressure at a depth of 6m?
    A. 65 kPa
    B. 58.86 kPa
    C. 57.86 kPa
    D. 75 kPa

B. 58.86 kPa

22. Which of the following is a head loss of 100 psi, if the fluid is water?
    A. 231 ft
    B. 23.1 ft
    C. 2310 ft
    D. 2.31 ft

A. 231 ft

23. The static head of the pump is the sum of:
    A. Static suction head and static discharge head
    B. Suction pressure and discharge pressure
    C. Suction head and discharge head
    D. None of the above

A. Static suction head and static discharge head

24. Which of the following is the static discharge head?
    A. Static suction head + total head
    B. Static discharge head + static suction head
    C. Total head - static suction head
    D. Total head - static suction head - friction

C. Total head - static suction head

25. The actual pump work is the same as:
    A. Head
    B. Work done by the pump
    C. Water power
    D. Mechanical power

B. Work done by the pump

26. Which of the following is the efficiency of a pump?
    A. $\eta = \text{Brake Power} / \text{Water Power}$
    B. $\eta = \text{Mechanical Power} / \text{Water Power}$
    C. $\eta = \text{Water Power} / \text{Brake Power}$
    D. $\eta = \text{Water Power} / \text{Mechanical Power}$

C. $\eta = \text{Water Power} / \text{Brake Power}$

27. The function of a pump or compressor is to
    A. Transfer heat from one fluid to another
    B. Increase the total energy content of the flow
    C. Extract energy from the flow
    D. Exchange heat to increase energy to the flow

B. Increase the total energy content of the flow

28. An aftercooler on a reciprocating air compressor is used primarily to:
    A. Cool the lubricating oil
    B. Condense the moisture in the compressed air
    C. Improve compressor efficiency
    D. Increase compressor capacity

B. Condense the moisture in the compressed air

29. Which of the following is NOT an advantage of a reciprocating compressor over a centrifugal compressor?
    A. Low maintenance cost
    B. Low capital cost
    C. Ability to handle high pressures
    D. Adaptability to a wide variety of compressed fluids

A. Low maintenance cost

30. The function of an intercooler on a multi-stage compressor is to:
    A. Cool the compressed gas
    B. Remove the water vapor
    C. Increase the compressor capacity
    D. Decrease the compressor work

D. Decrease the compressor work

31. The primary purpose of using an aftercooler on an air compressor is to:
    A. Condense water vapor from the compressed gas
    B. Lower the cost of compression
    C. Facilitate easier compression
    D. Lower the volume of the compressed air

A. Condense water vapor from the compressed gas

32. What is the power required for a centrifugal pump with a capacity of 200 gal/min and a head of 200 ft, if the efficiency is 80%?
    A. 12.6 HP
    B. 10.2 HP
    C. 15.75 HP
    D. 20.1 HP

C. 15.75 HP

33. Which of the following is the total work done by the pump?
    A. $W = Q \gamma (H{d} + H{s})$
    B. $W = Q \gamma (H{d} - H{s})$
    C. $W = Q \gamma H$
    D. $W = Q \gamma H_{total}$

C. $W = Q \gamma H$

34. Which of the following is the head developed in a pump?
    A. $H = \text{suction head} + \text{discharge head}$
    B. $H = \text{suction pressure} - \text{discharge pressure}$
    C. $H = \text{discharge head} - \text{suction head}$
    D. $H = \text{suction head} - \text{discharge head}$

C. $\text{discharge head} - \text{suction head}$

35. A reciprocating pump is considered positive displacement pump because
    A. Displacement of the liquid is affected by the displacement of the piston
    B. Positive pressure is given to the liquid
    C. Liquid is discharge with positive pressure
    D. Liquid is lifted due to the vacuum created inside the cylinder

A. Displacement of the liquid is affected by the displacement of the piston

36. To protect adequately the engine bearings, what type and better arrangement of lubricating oil filter is most practical?
    A. Full flow filter with bypass
    B. Full flow
    C. Bypass flow filter with full flow
    D. Centrifugal oil filter

A. Full flow filter with bypass

37. A pump is required to deliver 200 liters per minute of water from an open tank to an open tank. The total head is 50 m. If the efficiency is 60%, what is the power of the pump?
    A. 2.72 kW
    B. 3.25 kW
    C. 2.50 kW
    D. 2.25 kW

A. 2.72 kW

38. Which of the following is generally employed for pumping sewage?
    A. Reciprocating pump
    B. Centrifugal pump
    C. Air lift pump
    D. Gear pump

B. Centrifugal pump

39. A low head, high capacity pump.
    A. Centrifugal pump
    B. Reciprocating pump
    C. Piston pump
    D. Axial flow pump

D. Axial flow pump

40. What is the velocity head for a flow of 100 liters per second of water in a pipe with a diameter of 200 mm?
    A. 1.50 m
    B. 2.05 m
    C. 2.04 m
    D. 1.04 m

C. 2.04 m

41. Which of the following is not a positive displacement pump?
    A. Reciprocating pump
    B. Centrifugal pump
    C. Gear pump
    D. Lobe pump

B. Centrifugal pump

42. What is the velocity of flow for a discharge of 100 liters per second of water in a pipe with a diameter of 200 mm?
    A. 3.18 m/s
    B. 2.50 m/s
    C. 3.0 m/s
    D. 4.0 m/s

A. 3.18 m/s

43. Mr. De La Cruz wanted to buy a pump for his farm. What is suitable for deep well?
    A. Reciprocating
    B. Airlift
    C. Hand lift
    D. Centrifugal

D. Centrifugal

44. What is the discharge capacity of a centrifugal pump?
    A. $\text{Q} = \text{Area} / \text{Velocity}$
    B. $\text{Q} = \text{Area} \times \text{Velocity}$
    C. $\text{Q} = \text{Area} + \text{Velocity}$
    D. $\text{Q} = \text{Area} - \text{Velocity}$

B. $\text{Q} = \text{Area} \times \text{Velocity}$

45. In a centrifugal pump with a discharge of 100 liters per second, which of the following is the area of a pipe with a diameter of 200 mm?
    A. $0.0314 m^{2}$
    B. $0.314 m^{2}$
    C. $3.14 m^{2}$
    D. $31.4 m^{2}$

A. $0.0314 m^{2}$

46. What is the power of a pump if the discharge is 100 liters per second and the head is 50 m?
    A. 50.0 kW
    B. 50.0 HP
    C. 49.05 kW
    D. 49.05 HP

C. 49.05 kW

47. Which of the following is the total head of the pump?
    A. Discharge head + velocity head
    B. Suction head + discharge head
    C. Discharge head + suction head + friction
    D. Suction head + discharge head + friction

D. Suction head + discharge head + friction

48. A pump with a capacity of 100 gallons per minute and a head of 50 ft. What is the power of the pump?
    A. 1.25 HP
    B. 1.06 HP
    C. 1.10 HP
    D. 1.35 HP

D. 1.35 HP

49. The velocity head for a flow of 100 gal/min in a pipe with a diameter of 200 mm.
    A. 0.05 m
    B. 0.04 m
    C. 0.05 ft
    D. 0.04 ft

A. 0.05 m

50. What is the power required for a centrifugal pump with a capacity of 100 gal/min and a head of 50 ft, if the efficiency is 70%?
    A. 1.93 HP
    B. 1.63 HP
    C. 1.83 HP
    D. 2.03 HP

A. 1.93 HP

51. The total dynamic head is the vertical distance from the free level of the source of supply to the free level of the liquid in the discharge well plus the:
    A. Losses due to friction
    B. Velocity head
    C. Losses due to friction and velocity head
    D. Losses due to friction and entrance and exit losses

D. Losses due to friction and entrance and exit losses

52. A pump with the shaft normally in a horizontal position
    A. Centrifugal pump
    B. End suction pump
    C. In line pump
    D. Horizontal pump

D. Horizontal pump

53. A centrifugal pump whose drive unit is supported by the pump having its suction and discharge flanges on approximately the same center.
    A. Horizontal split case pump
    B. End suction pump
    C. In line pump
    D. Vertical shaft turbine pump

C. In line pump

54. A pump whose total head is developed by the action of the propeller or rotor on the liquid.
    A. Centrifugal pump
    B. Turbine pump
    C. Propeller pump
    D. In line pump

C. Propeller pump

55. A pump in which the liquid is lifted by compressed air
    A. Airlift pump
    B. Jet pump
    C. Propeller pump
    D. End suction pump

A. Airlift pump

56. The maximum safe water lift of a centrifugal pump is:
    A. $15 \text{ ft}$
    B. $22 \text{ ft}$
    C. $25 \text{ ft}$
    D. $30 \text{ ft}$

C. $25 \text{ ft}$

57. Which of the following is not a positive displacement pump?
    A. Piston pump
    B. Plunger pump
    C. Diaphragm pump
    D. Centrifugal pump

D. Centrifugal pump

58. A positive displacement pump which is used for liquid-solid mixtures.
    A. Diaphragm pump
    B. Piston pump
    C. Plunger pump
    D. Gear pump

A. Diaphragm pump

59. Which of the following is the theoretical velocity of flow in a centrifugal pump?
    A. $V = \sqrt{2gH}$
    B. $V = \sqrt{2g}$
    C. $V = \sqrt{2g \times \text{discharge head}}$
    D. $V = \sqrt{2g \times \text{suction head}}$

A. $V = \sqrt{2gH}$

60. Which of the following is the actual discharge of a pump?
    A. $Q{act} = C{v} \times Q{th}$ B. $Q{act} = C{d} \times Q{th}$
    C. $Q{act} = C{c} \times Q{th}$ D. $Q{act} = Q{th} / C{d}$

B. $Q{act} = C{d} \times Q_{th}$

61. The level with respect to the pump, of the body of water from which it takes suction when the pump is not in operation.
    A. Static water level
    B. Pumping water level
    C. Suction head
    D. Discharge head

A. Static water level

62. The level with respect to the pump, of the body of water from which it takes suction when the pump is in operation.
    A. Static water level
    B. Pumping water level
    C. Suction head
    D. Discharge head

B. Pumping water level

63. What is the level with respect to the pump, of the body of water to which the pump delivers when the pump is in operation?
    A. Static water level
    B. Pumping water level
    C. Suction head
    D. Discharge head

D. Discharge head

64. What do you call the difference in elevation between the pump center line and the free surface of the water?
    A. Static suction head
    B. Static discharge head
    C. Dynamic head
    D. Total head

A. Static suction head

65. What is the difference in elevation between the surface of the water in the discharge well and the pump centerline?
    A. Static suction head
    B. Static discharge head
    C. Dynamic head
    D. Total head

B. Static discharge head

66. What is the sum of the total static head and the velocity head plus all losses?
    A. Dynamic head
    B. Total head
    C. Static head
    D. Pumping head

B. Total head

67. Which of the following is the power supplied to the pump by the motor?
    A. Water power
    B. Hydraulic power
    C. Brake power
    D. Mechanical power

C. Brake power

68. Which of the following is the power delivered by the pump to the fluid?
    A. Water power
    B. Hydraulic power
    C. Brake power
    D. Mechanical power

A. Water power

69. The total head loss in the pump is the sum of:
    A. Suction loss and discharge loss
    B. Friction loss and minor loss
    C. Pressure loss and velocity loss
    D. Water power and brake power

A. Suction loss and discharge loss

70. Which of the following is NOT an advantage of a reciprocating pump over a centrifugal pump?
    A. Handles high pressure
    B. Can handle wide viscosity
    C. Handles high suction lift
    D. Requires less floor space

D. Requires less floor space

71. What is the maximum safe water lift for a reciprocating pump?
    A. 15 ft
    B. 22 ft
    C. 25 ft
    D. 30 ft

B. 22 ft

72. Which of the following is NOT a type of rotary pump?
    A. Gear pump
    B. Vane pump
    C. Lobe pump
    D. Centrifugal pump

D. Centrifugal pump

73. Which of the following is NOT a part of a centrifugal pump?
    A. Impeller
    B. Casing
    C. Piston
    D. Shaft

C. Piston

74. Provides passage to distribute the sealing medium uniformly around the portion of the shaft that passes through the stuffing box. Also known as water seal of lantern ring.
    A. Packing
    B. Gland
    C. Seal gage
    D. Mechanical seal

C. Seal gage

75. Provides a mechanical sealing arrangement that takes the place of the packing.
    A. Packing
    B. Gland
    C. Seal gage
    D. Mechanical seal

D. Mechanical seal

76. A type of rotary pump which is used for high viscosity fluid.
    A. Gear pump
    B. Vane pump
    C. Lobe pump
    D. Screw pump

D. Screw pump

77. The maximum safe water lift of a centrifugal pump is
    A. 15 ft
    B. 22 ft
    C. 25 ft
    D. 30 ft

C. 25 ft

78. What do you call the total head developed by the pump?
    A. Hydraulic power
    B. Water power
    C. Brake power
    D. Total dynamic head

D. Total dynamic head

79. The total friction loss in a pipe line is the sum of:
    A. Major losses and minor losses
    B. Suction loss and discharge loss
    C. Pressure loss and velocity loss
    D. Water power and brake power

A. Major losses and minor losses

80. Which of the following is the theoretical discharge of a pump?
    A. $Q{th} = A \times L \times N$ B. $Q{th} = A \times L \times N / 60$
    C. $Q{th} = A \times L \times N / 1000$ D. $Q{th} = A \times L \times N \times 60$

A. $Q_{th} = A \times L \times N$

81. A type of rotary pump consists of one rotor in a casing machined eccentrically to the drive shaft. The rotor is fitted with a series of vanes which are moved outward to the casing wall by centrifugal force or springs.
    A. Gear pump
    B. Vane pump
    C. Lobe pump
    D. Screw pump

B. Vane pump

82. A type of rotary pump consists of a casing with two or three parallel shafts. On each shaft, there are two, three or four helical rotors arranged so that a cavity is formed for transporting the liquid axially as the shafts rotate.
    A. Gear pump
    B. Vane pump
    C. Lobe pump
    D. Screw pump

D. Screw pump

83. A type of rotary pump consists of a casing with two parallel shafts. The rotors are generally not in contact with each other but are timed by external gears.
    A. Gear pump
    B. Vane pump
    C. Lobe pump
    D. Screw pump

C. Lobe pump

84. A reciprocating pump that has a rotary motion of a revolving crankshaft by means of a crank and connecting rod.
    A. Direct acting steam pump
    B. Crank and flywheel reciprocating pump
    C. Power driven pump
    D. Piston pump

C. Power driven pump

85. A type of deep well pump which are refinement of the old hand pump that have played such an important role in country home and small town water supply from wells.
    A. Plunger pump
    B. Turbine pump
    C. Ejector centrifugal pump
    D. Air lift

A. Plunger pump

86. A type of deep well pump that represent the application of vertical centrifugal pump to deep well service and are built for heads up to 305 meters and for capacities up to 28,495 liters per minute.
    A. Plunger pump
    B. Turbine pump
    C. Ejector centrifugal pump
    D. Air lift

B. Turbine pump

87. A type of deep well pump that has come into wide use for small capacities combines a single stage centrifugal pump at the top of the well and an ejector or jet located down in the water.
    A. Plunger pump
    B. Turbine pump
    C. Ejector centrifugal pump
    D. Air lift

C. Ejector centrifugal pump

88. A type of deep well pump wherein compressed air is admitted to the well to lift the water to the surface.
    A. Plunger pump
    B. Turbine pump
    C. Ejector centrifugal pump
    D. Air lift

D. Air lift

89. Which of the following is an example of an impulse turbine?
    A. Francis turbine
    B. Kaplan turbine
    C. Pelton wheel
    D. All of the above

C. Pelton wheel

90. Which of the following is the theoretical velocity of flow in a turbine?
    A. $V = \sqrt{2gH}$
    B. $V = \sqrt{2g}$
    C. $V = \sqrt{2g \times \text{discharge head}}$
    D. $V = \sqrt{2g \times \text{suction head}}$

A. $V = \sqrt{2gH}$

91. Which of the following is the theoretical work done by the turbine?
    A. $W = Q \gamma (H{d} + H{s})$
    B. $W = Q \gamma (H{d} - H{s})$
    C. $W = Q \gamma H$
    D. $W = Q \gamma H_{total}$

C. $W = Q \gamma H