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A 200V, 10 hp, 4 poles, 60 Hz, Y-connected induction motor had full load slip of 5%. Then the rotor speed of the motor with respect to stator is?

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A 200V, 10 hp, 4 poles, 60 Hz, Y-connected induction motor had full load slip of 5%. Then the rotor speed of the motor with respect to stator is?

(a) 1710 rpm

(b) 1800 rpm

(c) 90 rpm

(d) 3510 rpm

I have been asked this question by my school principal while I was bunking the class.

The origin of the question is Machine Ratings topic in section Rating and Loss Dissipation of Electrical Machines

1 Answer

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The correct answer is (a) 1710 rpm

For explanation: Synchronous speed, Ns = 120*f/P = 120*60/4 = 1800 rpm

             Rotor speed = (1-slip)*Ns = 0.95*1800 = 1710 rpm.

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