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Speed control is possible for _______ and not possible for __________

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Speed control is possible for _______ and not possible for __________

(a) induction motor, synchronous motor

(b) induction motor, differential motor

(c) synchronous motor, synchronous-induction motor

(d) dc motor, induction motor

I have been asked this question in an online interview.

I would like to ask this question from Applications of Polyphase Induction Motors in section Induction Machines of Electrical Machines

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The correct option is (a) induction motor, synchronous motor

The best explanation: Speed can be adjusted for a induction motor while it can not be altered for a synchronous motor operating at normal speed.

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