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The mmf produced by the current of the three phase induction motor _________

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The mmf produced by the current of the three phase induction motor _________

(a) is standstill with respect to stator mmf

(b) rotates at the speed of rotor in air gap

(c) rotates at slip speed with respect to stator mmf

(d) rotates at synchronous speed with respect to rotor

The question was asked by my college professor while I was bunking the class.

The question is from Rotor EMF, Current and Power topic in division Induction Machines of Electrical Machines

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Correct option is (a) is standstill with respect to stator mmf

Easy explanation: The mmf produced will also be at synchronous speed and it will be stationary with respect to stator mmf which itself rotates at synchronous speed.

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