Question

A 3-phase induction motor is operating at slip ‘s’. If the slip is reversed, its slip at the instant will be _________

(a) 2-s

(b) zero

(c) 2+s

(d) 1-s

The question was asked during an interview for a job.

My question is taken from Rotor EMF, Current and Power in division Induction Machines of Electrical Machines

Answer 1

The correct answer is (a) 2-s

To explain: For the reversed phase sequence the slip becomes 2-s.