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Polyphase Induction Motors - Interview Questions and Answers

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6. The injected e.m.f. in the rotor of induction motor must have
A. zero frequency
B. the same frequency as the slip fre-quency
C. the same phase as the rotor e.m.f.
D. high value for the satisfactory speed control
Explanation:
7. The crawling in the induction motor is caused by
A. low voltage supply
B. high loads
C. harmonics develped in the motor
D. improper design of the machine
Explanation:
8. The shaft of an induction motor is made of
A. stiff
B. flexible
C. hollow
D. any of the above
Explanation:
9. The starting torque of a squirrel-cage induction motor is
A. low
B. negligible
C. same as full-load torque
D. slightly more than full-load torque
Explanation:
10. The good power factor of an induction motor can be achieved if the average flux density in the air gap is
A. absent
B. small
C. large
D. infinity
Explanation:
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