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Polyphase Induction Motors - Interview Questions and Answers

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1. The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type
A. star connected only
B. delta connected only
C. (a) and (b) both
D. none of the above
Explanation:
2. Slip rings are usually made of
A. copper
B. carbon
C. phospor bronze
D. aluminium
Explanation:
3. Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ?
A. By changing the number of stator poles
B. Rotor rheostat control
C. By operating two motors in cascade
D. By injecting e.m.f. in the rotor circuit
Explanation:
4. The frame of an induction motor is usually made of
A. silicon steel
B. cast iron
C. aluminium
D. bronze
Explanation:
5. An induction motor is identical to
A. D.C. compound motor
B. D.C. series motor
C. synchronous motor
D. asynchronous motor
Explanation:
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