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Polyphase Induction Motors - Interview Questions and Answers

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71. The rotor of an induction motor runs at
A. synchronous speed
B. below synchronous speed
C. above synchronous speed
D. any of the above
Explanation:
72. The low power factor of induction motor is due to
A. rotor leakage reactance
B. stator reactance
C. the reactive lagging magnetizing current necessary to generate the magnetic flux
D. all of the above
Explanation:
73. Slip ring motor is preferred over squirrel cage induction motor where
A. high starting torque is required
B. load torque is heavy
C. heavy pull out torque is required
D. all of the above
Explanation:
74. In a squirrel cage motor the induced e.m.f. is
A. dependent on the shaft loading
B. dependent on the number of slots
C. slip times the stand still e.m.f. induced in the rotor
D. none of the above
Explanation:
75. In a star-delta starter of an induction motor
A. resistance is inserted in the stator
B. reduced voltage is applied to the stator
C. resistance is inserted in the rotor
D. applied voltage per1 stator phase is 57.7% of the line voltage
Explanation:
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