A 3-phase slip ring IM is has its copper bars changed by the aluminium bars in the machine. With the above change ___________(a) starting torque remains same(b) starting torque increase(c) starting torque decrease(d) maximum torque increaseThe question was asked during an interview for a job.This intriguing question originated from Starting of Polyphase Induction Motors-II topic in portion Starting of Induction Motors of Electrical Machines

A 3-phase slip ring IM is has its copper bars changed by the aluminium

1.	A 3-phase slip ring IM is has its copper bars changed by the aluminium bars in the machine. With the above change ___________(a) starting torque remains same(b) starting torque increase(c) starting torque decrease(d) maximum torque increaseThe question was asked during an interview for a job.This intriguing question originated from Starting of Polyphase Induction Motors-II topic in portion Starting of Induction Motors of Electrical Machines
Answer» The correct answer is (a) starting TORQUE remains same To EXPLAIN I would say: Resistance increase, so the starting torque increase.

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