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A 3-phase, 4-pole, 50 Hz induction motor is uses DOL method of starting. It is later replaced by reactance method of starting with a fraction of ‘x’, then the starting torque reduces by?

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A 3-phase, 4-pole, 50 Hz induction motor is uses DOL method of starting. It is later replaced by reactance method of starting with a fraction of ‘x’, then the starting torque reduces by?

(a) x

(b) x^2

(c) 1/x

(d) no change in the starting current

I had been asked this question during a job interview.

The origin of the question is Starting of Polyphase Induction Motors-I topic in division Starting of Induction Motors of Electrical Machines

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The correct answer is (b) x^2

The explanation: Tst/Tfl = (x^2)(Ist/Ifl)^2*slip.

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