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The direction of rmf when a single phase supply is given to stator of three phase induction motor is?

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The direction of rmf when a single phase supply is given to stator of three phase induction motor is?

(a) Zero

(b) Ns

(c) 2Ns

(d) -Ns

I have been asked this question in an interview.

This question is from Principle of Operation in portion Induction Machines of Electrical Machines

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Best answer
Correct choice is (a) Zero

To explain I would say: There will be no rmf generated as a single phase is only fed to the three phase of induction motor.

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