Question

A constant torque variable power drive of induction machine has ___________

(a) constant air gap flux.

(b) constant slip

(c) variable air gap flux, constant slip

(d) constant slip, constant air gap flux

This question was addressed to me in examination.

Question is taken from Starting of Polyphase Induction Motors-II topic in section Starting of Induction Motors of Electrical Machines

Answer 1

Right answer is (d) constant slip, constant air gap flux

To elaborate: A constant torque drive should have constant flux and hence constant air gap flux. Also it should have constant slip.