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At starting, developed mechanical power is _____ and developed torque is ______

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At starting, developed mechanical power is _____ and developed torque is ______

(a) zero, not zero

(b) zero,zero

(c) not zero, zero

(d) not zero, maximum

I have been asked this question during an interview.

My question is from Analysis of the Equivalent Circuit topic in chapter Induction Machines of Electrical Machines

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Right choice is (a) zero, not zero

Explanation: At start, torque is not zero.

             P α (1-s)/s; so it is zero at s = 1.

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