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Polyphase Induction Motors - Interview Questions and Answers

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86. In induction motor, percentage slip depends on
A. supply frequency
B. supply voltage
C. copper losses in motor
D. none of the above
Explanation:
87. The torque of an induction motor is
A. directly proportional to slip
B. inversely proportional to slip
C. proportional to the square of the slip
D. none of the above
Explanation:
88. An induction motor can run at synchronous speed when
A. it is run on load
B. it is run in reverse direction
C. it is run on voltage higher than the rated voltage
D. e.m.f. is injected in the rotor circuit
Explanation:
89. Star-delta starting of motors is not possible in case of
A. single phase motors
B. variable speed motors
C. low horse power motors
D. high speed motors
Explanation:
90. Reduced voltage starter can be used with
A. slip ring motor only but not with squirrel cage induction motor
B. squirrel cage induction motor only but not with slip ring motor
C. squirrel cage as well as slip ring induction motor
D. none of the above
Explanation:
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