Question 1

The speed of the rotor of an induction motor depends upon the synchronous speed and the load it must drive.

Accepted Answer

A) True 
 B)False

Question 2

The difference between the synchronous speed and the rotor speed is called the ____ of the rotor.

Accepted Answer

A)   differential
B)   frequency
C)   phase difference
D)   slipE) None of the above
F) A) and B)

Question 3

A capacitor-start, induction-run motor called a(n)  ____ motor is frequently used for installations requiring higher starting torque than is available from the resistance split-phase motor.

Accepted Answer

A)   induction split-phase
B)   single-phase
C)   capacitor resistance-start
D)   capacitor split-phaseE) All of the above
F) None of the above D

Question 4

What purpose does brush-shifting accomplish in a motor?

Accepted Answer

A)   Adjusts the rotor speed
B)   Compensates for hysteresis
C)   Changes the frequency
D)   Allows it to operate on AC or DCE) None of the above
F) A) and B) A

Question 5

The magnetic field of a two-pole induction motor completes ____ revolutions per minute when supplied with 60 Hz.

Accepted Answer

A)   60
B)   180
C)   1800
D)   3600E) A) and B)
F) All of the above

Question 6

To determine the synchronous speed of a motor, multiple 120 by the frequency of the supply current in hertz and divide their product by the ____.

Accepted Answer

A)   output voltage in volts
B)   number of poles on the stator
C)   resistance of the rotor windings in ohms
D)   inductive reactance of the rotor in henriesE) A) and D)
F) None of the above

Question 7

Single-phase, ____ motors are started by means of a low-resistance short-circuited coil placed around one tip of each pole.

Accepted Answer

A)   permanent capacitor
B)   reversing
C)   resistance
D)   shaded-poleE) All of the above
F) None of the above

Question 8

The ____ motor is a single-phase motor that starts based on the principle that like poles repel.

Accepted Answer

A)   universal
B)   repulsion-start, induction-run
C)   torque
D)   reversing split-phaseE) C) and D)
F) A) and C)

Question 9

The induction motor is the most common type of AC motor.

Accepted Answer

A) True 
 B)False

Question 10

A(n)  ____ motor is an AC motor in which the rotor revolves at the same speed as the rotating magnetic field.

Accepted Answer

A)   high-frequency
B)   multispeed squirrel-cage
C)   polyphase synchronous
D)   adjustable-speed inductionE) C) and D)
F) B) and C) C

Question 11

To reverse the direction of rotation of the rotor, you would ____.

Accepted Answer

A)   reverse the polarity of one of the fields
B)   reverse the polarity of both of the fields
C)   increase the operating frequency
D)   attach a permanent capacitorE) C) and D)
F) B) and D)

Question 12

On the three-phase motor, the windings are arranged to produce a rotating magnetic field when connected to a three-phase source.

Accepted Answer

A) True 
 B)False

Question 13

The two main components of an induction motor are the stator and the conductor.

Accepted Answer

A) True 
 B)False

Question 14

One method of making a single-phase motor self-starting is to apply the ____ principle.

Accepted Answer

A)   phase-splitting
B)   current-splitting
C)   voltage-splitting
D)   resistance-splittingE) All of the above
F) A) and C)

Question 15

One advantage of the wound-rotor induction motor compared to the squirrel-cage motor is that it has lower initial cost and maintenance costs.

Accepted Answer

A) True 
 B)False

Exam 19: Ac Motors

The speed of the rotor of an induction motor depends upon the synchronous speed and the load it must drive.

Correct Answer
verified

The difference between the synchronous speed and the rotor speed is called the ____ of the rotor.

Correct Answer
verified

A capacitor-start, induction-run motor called a(n) ____ motor is frequently used for installations requiring higher starting torque than is available from the resistance split-phase motor.

Correct Answer
verified
D

What purpose does brush-shifting accomplish in a motor?

Correct Answer
verified
A

The magnetic field of a two-pole induction motor completes ____ revolutions per minute when supplied with 60 Hz.

Correct Answer
verified

To determine the synchronous speed of a motor, multiple 120 by the frequency of the supply current in hertz and divide their product by the ____.

Correct Answer
verified

Single-phase, ____ motors are started by means of a low-resistance short-circuited coil placed around one tip of each pole.

Correct Answer
verified

The ____ motor is a single-phase motor that starts based on the principle that like poles repel.

Correct Answer
verified

The induction motor is the most common type of AC motor.

Correct Answer
verified

A(n) ____ motor is an AC motor in which the rotor revolves at the same speed as the rotating magnetic field.

Correct Answer
verified
C

To reverse the direction of rotation of the rotor, you would ____.

Correct Answer
verified

On the three-phase motor, the windings are arranged to produce a rotating magnetic field when connected to a three-phase source.

Correct Answer
verified

The two main components of an induction motor are the stator and the conductor.

Correct Answer
verified

One method of making a single-phase motor self-starting is to apply the ____ principle.

Correct Answer
verified

One advantage of the wound-rotor induction motor compared to the squirrel-cage motor is that it has lower initial cost and maintenance costs.

Correct Answer
verified

Exam 19: Ac Motors

The speed of the rotor of an induction motor depends upon the synchronous speed and the load it must drive.

Correct AnswerverifiedShow Answer

The difference between the synchronous speed and the rotor speed is called the ____ of the rotor.

Correct AnswerverifiedShow Answer

A capacitor-start, induction-run motor called a(n) ____ motor is frequently used for installations requiring higher starting torque than is available from the resistance split-phase motor.

Correct AnswerverifiedD

What purpose does brush-shifting accomplish in a motor?

Correct AnswerverifiedA

The magnetic field of a two-pole induction motor completes ____ revolutions per minute when supplied with 60 Hz.

Correct AnswerverifiedShow Answer

To determine the synchronous speed of a motor, multiple 120 by the frequency of the supply current in hertz and divide their product by the ____.

Correct AnswerverifiedShow Answer

Single-phase, ____ motors are started by means of a low-resistance short-circuited coil placed around one tip of each pole.

Correct AnswerverifiedShow Answer

The ____ motor is a single-phase motor that starts based on the principle that like poles repel.

Correct AnswerverifiedShow Answer

The induction motor is the most common type of AC motor.

Correct AnswerverifiedShow Answer

A(n) ____ motor is an AC motor in which the rotor revolves at the same speed as the rotating magnetic field.

Correct AnswerverifiedC

To reverse the direction of rotation of the rotor, you would ____.

Correct AnswerverifiedShow Answer

On the three-phase motor, the windings are arranged to produce a rotating magnetic field when connected to a three-phase source.

Correct AnswerverifiedShow Answer

The two main components of an induction motor are the stator and the conductor.

Correct AnswerverifiedShow Answer

One method of making a single-phase motor self-starting is to apply the ____ principle.

Correct AnswerverifiedShow Answer

One advantage of the wound-rotor induction motor compared to the squirrel-cage motor is that it has lower initial cost and maintenance costs.

Correct AnswerverifiedShow Answer

Correct Answer
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D

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A

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C

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