Question

The rotor of the induction motor must never run at synchronous speed because then the relative speed between the rotating flux and rotor will be _________

(a) zero and hence torque will be zero

(b) zero, and torque will be maximum

(c) maximum and hence, torque will be zero

(d) maximum, and torque will also be zero

I got this question in a national level competition.

This key question is from Rotor EMF, Current and Power topic in section Induction Machines of Electrical Machines

Answer 1

Correct option is (a) zero and hence torque will be zero

The best explanation: At synchronous speed the slip will be zero and so the torque.