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A three-phase slip ring induction motor is fed from the rotor side with the stator winding short-circuited. The frequency of the current flowing in the short-circuited stator is ____________

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A three-phase slip ring induction motor is fed from the rotor side with the stator winding short-circuited. The frequency of the current flowing in the short-circuited stator is ____________

(a) Slip frequency

(b) Supply frequency

(c) The frequency corresponding to rotor speed

(d) Zero

I have been asked this question during an online interview.

This interesting question is from DC Motors in section Characteristics of DC & AC Motors of Electric Drives

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Correct option is (a) Slip frequency

To explain I would say: The relative speed between rotor magnetic field and stator conductors is sip speed and hence the frequency of induced e.m.f is equal to slip frequency.

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