A 3-phase, 4-pole, 50 Hz induction motor is uses DOL method of starting. It is later replaced by auto transformer method of starting with a tapping ratio of ‘x’, then the starting torque will be?

A 3-phase, 4-pole, 50 Hz induction motor is uses DOL method of starting. It is later replaced by auto transformer method of starting with a tapping ratio of ‘x’, then the starting torque will be?

(a) x *Tfl

(b) x^2 *Tfl

(c) 1/x *Tfl

(d) no change in the starting current

I got this question in an interview.

My query is from Starting of Polyphase Induction Motors-I topic in portion Starting of Induction Motors of Electrical Machines

A 3-phase, 4-pole, 50 Hz induction motor is uses DOL method of starting. It is later replaced by auto transformer method of starting with a tapping ratio of ‘x’, then the starting torque will be?

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