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Process Technology Equipment, 2e (NAPTA)
Chapter 6 Pumps
1) Which of the following is an application of pumps?
A) Filling tanks
B) Emptying trenches
C) Supplying water to boilers
D) All of the above
2) What category of pumps uses impellers to generate centrifugal force?
A) Dynamic pumps
B) Centrifugal pumps
C) Rotary pumps
D) Positive displacement pumps
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3) What do the density and specific gravity affect in pump selection?
A) The liquid's viscosity
B) Net positive suction head
C) The horsepower required by the pump
D) The pressure that exists at the suction end of a pump
4) What type of pump uses an impeller on a rotating shaft to generate pressure and move liquids
to the outer casing within the pump and then out through the discharge shaft?
A) Axial pump
B) Rotary pump
C) Centrifugal pump
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5) Which of the following is an advantage of a vertical centrifugal pump?
A) It takes up more space.
B) It can withstand higher operating temperatures.
C) The motor is situated on top of the pump and must be removed to work on it.
D) All of the above
6) What specialty pumps would you use with liquids that are difficult to seal?
A) Canned pumps
B) Axial pumps
C) High-speed centrifugal pumps
D) Jet pumps
7) Which of the following is an advantage of using lobe pumps?
A) They are suitable for low-viscosity liquids.
B) They have high suction abilities.
C) They can handle slurries with a large particle size.
D) They do not require factory service for repairs.
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8) What type of reciprocating pumps are driven by a motor, air, hydraulics, or direct-acting
steam?
A) Piston pumps
B) Plunger pumps
C) Diaphragm pumps
D) Rotary pump
9) What type of sealing arrangement for pumps is used in nontoxic, nonflammable, and
nonpolluting applications?
A) Mechanical packing
B) Mechanical seal
C) Physical seal
D) Physical packing
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10) What type of seal system has a primary seal and a backup seal?
A) Seal pot
B) Seal flush
C) Tandem seal
11) What type of loads are perpendicular to the shaft?
A) Axial
B) Radial
C) Mechanical
D) Stationary
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12) How is the amount of head determined in a pump?
A) By the height of the liquid
B) By the weight of the liquid
C) By the viscosity of the liquid
D) By the temperature of the liquid
13) What is the vertical distance between the centerline of a pump and the surface of the liquid
on the suction side of the pump?
A) Head
B) Total head
C) Discharge static head
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14) Which of the following affects the discharge flow rate?
A) Piping size
B) Downstream vessel size
C) Discharge head
D) All of the above
15) Which of the following is contained in the manufacturer's supply performance pump curve
for centrifugal pumps?
A) Head
B) Flow rate
C) Efficiency
D) All of the above
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16) How is efficiency calculated with regards to the performance pump curve?
A) The efficiency is the maximum flow rate at zero flow.
B) The efficiency is the ratio of the liquid horsepower to the brake horsepower.
C) The efficiency is normally based on evaluation with water.
D) The efficiency is calculated using atmospheric pressure, vapor pressure, liquid height, and
17) If the specific gravity of the material is less than 1.0, what is true of horsepower?
A) Less horsepower is required.
B) More horsepower is required.
C) No horsepower is required.
D) Horsepower will depend on the viscosity of the liquid.
18) What problem can occur if the valves beyond the pump are incorrectly closed or blocked?
A) Leakage
B) Cavitation
C) Overheating
D) Overpressurization
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19) What problem can occur when the pressure on the eye of a pump impeller falls below the
vapor pressure of the liquid being pumped?
A) Leakage
B) Cavitation
C) Overheating
D) Overpressurization
20) Which of the following is a cause of cavitation?
A) Flow rate too low
B) Suction pluggage
C) High liquid level
D) Decrease in liquid temperature
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21) Which of the following is a consequence of abnormal speed in a pump?
A) Cavitation
B) Overheating
C) Mechanical failure
D) All of the above
22) Which of the following is a consequence of excess vibration in a pump?
A) Cavitation
B) Overheating
C) Mechanical failure
D) All of the above
23) What can cause vibration?
A) Cavitation
B) New bearings
C) Low pump speed
D) All of the above
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24) Which of the following should process technicians do when monitoring and maintaining
pumps?
A) Monitor oil levels
B) Make sure water is collecting under the oil
C) Check suction pressure across strainers/screens
25) Which of the following is a typical step in the startup procedure for a pump?
A) Warm up equipment.
B) Check the seal flush system.
C) Drain the pump.
D) Close the pump suction.
26) Which of the following is a typical step in the lockout/tagout procedure for a pump?
A) Warm up equipment.
B) Ensure the flow rate is as expected.
C) Drain the pump.
D) Shut off the pump.
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27) Which of the following is a typical step in the shutdown procedure for a pump?
A) Cool down the equipment.
B) Ensure the flow rate is as expected.
C) Drain the pump.
D) Close the suction and discharge valves.
