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Torque-slip characteristic of an induction motor is linear in the smaller slip values, because ___________

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Torque-slip characteristic of an induction motor is linear in the smaller slip values, because ___________

(a) effective rotor resistance is very large compared to reactance

(b) rotor resistance is equal to stator resistance

(c) rotor resistance is equal to rotor reactance

(d) rotor reactance almost equal to stator reactance

This question was addressed to me in an interview for internship.

My enquiry is from Starting of Polyphase Induction Motors-II topic in section Starting of Induction Motors of Electrical Machines

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Correct choice is (a) effective rotor resistance is very large compared to reactance

Explanation: It is because effective resistance value(r2/s) is far more than reactance and so the torque is linear in this region.

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