A 3-phase ,400 V, 4-pole induction motor is fed from a 3-phase, 400V, 50 Hz supply and runs at 1440 rpm. The frequency of rotor emf is

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Q. A 3-phase ,400 V, 4-pole induction motor is fed from a 3-phase, 400V, 50 Hz supply and runs at 1440 rpm. The frequency of rotor emf is

(A) 2hz
(B) 50hz
(C) 4hz
(D) 0hz

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✅ Correct Answer: (A) 2hz

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