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Polyphase Induction Motors - Interview Questions and Answers

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11. In medium sized induction motors, the slip is generally around
A. 0.04%
B. 0.4%
C. 4%
D. 14%
Explanation:
12. A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be
A. 200 Hz
B. 50 Hz
C. 2 Hz
D. 0.2 Hz
Explanation:
13. In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be
A. Ns
B. s.N,
C. (l-s)Ns
D. (Ns-l)s
Explanation:
14. In squirrel cage induction motors, the rotor slots are usually given slight skew in order to
A. reduce windage losses
B. reduce eddy currents
C. reduce accumulation of dirt and dust
D. reduce magnetic hum
Explanation:
15. In an induction motor, no-load the slip is generally
A. less than 1%
B. 1.5%
C. 2%
D. 4%
Explanation:
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