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The torque in an induction motor varies as ______ and in synchronous motor as _________

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The torque in an induction motor varies as ______ and in synchronous motor as _________

(a) square of voltage, proportion to voltage

(b) proportion to voltage, proportion to voltage

(c) proportion to voltage, square of voltage

(d) square of voltage, square of voltage

The question was asked in a job interview.

My doubt is from Applications of Polyphase Induction Motors in chapter Induction Machines of Electrical Machines

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Correct answer is (a) square of voltage, proportion to voltage

Best explanation: Torque in induction motor varies as square of the voltage and in synchronous motor as linear to voltage.

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