Question

The rotor of a four-pole, 50 Hz slip-ring induction motor has a resistance of 0.2 per phase and runs at
1425 rpm at full-load. Determine the external resistance per phase which must be added to reduce the
speed to 1200 rpm, the torque remaining same in both the cases.
(A) O 0.82
(B) O 0.22
(C) O 0.6 Q (Correct Answer)
(D) O 0.42​

Answer 1

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