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Polyphase Induction Motors - Interview Questions and Answers

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21. Size of a high speed motor as compared to low speed motorfor the same H.P. will be
A. bigger
B. smaller
C. same
D. any of the above
Explanation:
22. In a three-phase induction motor, the number of poles in the rotor winding is always
A. zero
B. more than the number of poles in stator
C. less than number of poles in stator
D. equal to number of poles in stator
Explanation:
23. The shaft of an induction motor is made of
A. high speed steel
B. stainless steel
C. carbon steel
D. cast iron
Explanation:
24. The 'cogging' of an induction motor can be avoided by
A. proper ventilation
B. using DOL starter
C. auto-transformer starter
D. having number of rotor slots more or less than the number of stator slots (not equal)
Explanation:
25. The maximum torque in an induction motor depends on
A. frequency
B. rotor inductive reactance
C. square of supply voltage
D. all of the above
Explanation:
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