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A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Speed of the rotor field w.r.t. stator field is?

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A three phase, 50 Hz induction motor has a full load speed of 1440 rpm. Speed of the rotor field w.r.t. stator field is?

(a) zero

(b) 150 rad/s

(c) 6.28 rad/s

(d) 145 rad/s

This question was posed to me in examination.

I'm obligated to ask this question of Rotor Frequency topic in division Induction Machines of Electrical Machines

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Best answer
Correct answer is (a) zero

Best explanation: As both the rotor field and stator file rotate at synchronous speed, the relative speed between them is zero.

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