Question

For a constant load torque, the supply voltage of a squirrel cage induction motor is reduced by a factor of 0.5, its rotor current is modified by a factor is?

(a) 2

(b) 0.5

(c) 4

(d) 0.25

The question was posed to me in an interview for internship.

The origin of the question is Rotor EMF, Current and Power in chapter Induction Machines of Electrical Machines

Answer 1

Correct choice is (a) 2

To explain: For constant torque the product of emf and current should be constant.