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Process Technology Equipment, 2e (NAPTA)
Chapter 9 Motors and Engines
1) What is a mechanical driver that converts electrical energy into useful mechanical work and
provides power for rotating equipment?
A) Motor
B) Torque
C) Engine
2) What type of motor is most commonly used in situations where variable speed or high-torque
applications are needed?
A) AC
B) DC
C) Single or fixed speed
D) Variable speed
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3) What type of motor allows for the rotation speed of the motor to be adjusted?
A) AC
B) DC
C) Single or fixed speed
4) Which of the following is an advantage of three-phase, single-speed squirrel cage AC
induction motors?
A) They are larger.
B) They are less expensive.
C) They are maintenance free.
D) They are more efficient.
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5) What type of motors run at a fixed speed that is synchronized with the supply of electricity?
A) DC motors
B) Universal motors
C) Induction motors
D) Synchronous motors
6) Why are electric motors often preferred?
A) Reliability
B) Ease of use
C) Low maintenance cost
D) All of the above
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7) Which of the following is a disadvantage of steam turbines?
A) They are smaller and more compact than electric motors.
B) They can be used as a backup electrical generating source.
C) They require a boiler and all its auxiliaries to produce steam.
D) It is harder to vary the speed and energy output.
8) What is a structure that holds the internal components of a motor and motor mounts?
A) Shaft
B) Frame
C) Shroud
D) Stator
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9) What is a stationary part of the motor where the alternating current supplied to the motor
flows, creating a magnetic field using magnets and coiled wire?
A) Shaft
B) Frame
C) Shroud
D) Stator
10) What component of an internal combustion engine is a driven shaft fitted with rotating
wheels of irregular shape that open and close the valves in an engine?
A) Camshaft
B) Connecting rod
C) Exhaust port
D) Crankshaft
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11) What component of an internal combustion engine converts the piston's up-and-down or
forward-and-backward motion into rotational motion?
A) Camshaft
B) Connecting rod
C) Exhaust port
12) Which electromagnetic principle do electric motors operate on?
A) Electric current generates a magnetic field.
B) Like magnetic poles repel each other.
C) The direction of the electrical current determines the magnetic polarity.
D) All of the above
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13) What type of load occurs when the motor is not using torque?
A) No load
B) Half load
C) Partial load
D) Full load
14) What type of electric motors are most used in process facilities?
A) Single-phase electricity
B) Two-cycle engines
C) Three-phase electricity
D) Four-cycle engines
15) Which potential problem with electrical distribution and motors is caused by misalignment?
A) High vibration
B) High temperatures
C) Motor not starting
D) Equipment failure
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16) Which potential problem with electrical distribution and motors is caused by the loss of
cooling airflow?
A) High vibration
B) High temperatures
C) Motor not starting
D) Equipment failure
17) Which potential problem with electrical distribution and motors is caused by a locked rotor?
A) High vibration
B) High temperatures
C) Motor not starting
D) Equipment failure
18) What is the most common hazard associated with normal and abnormal operation of motors?
A) Shock
B) Burns
C) Injury by moving parts
D) All of the above
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19) What are the benefits of motor control centers?
A) They protect against short circuits.
B) They protect against overloading.
C) They protect against overspeed.
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20) What class of electrical hazard classifications is used to identify fibers that are easily
ignitable?
A) Class I
B) Class II
C) Class III
D) Class IV
21) What group designation would be used for a Class I electrical hazard?
A) B
B) E
C) F
D) G
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22) Which of the following is a role of a process technician with regard to the operation and
maintenance of motors?
A) Changing motor bearings
B) Monitoring lubrication
C) Providing proper documentation
D) Monitoring the condition of the rotors
23) Who is the key person for detecting an abnormal condition in an engine?
A) Supervisor
B) Process technician
C) Maintenance personnel
D) Manufacturer of the engine
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24) Which of the following is a critical part of a good lubrication program?
A) On-site inspection
B) Off-site analysis
C) Routine oil sampling
D) All of the above
25) Which of the following is a step in a typical startup procedure for a motor?
A) Inspect the circuit breaker and other electrical devices.
B) Centralize the isolation keys.
C) Observe the exhaust for smoke.
D) All of the above
