Question

If the operating voltage of the induction motor is increased by twice while keeping the frequency of the operation constant. Then the new starting torque will be?

(a) 4*T

(b) 1/4*T

(c) T

(d) 2*T

This question was addressed to me during an online exam.

I'd like to ask this question from Induction Motor Phasor Diagram topic in division Induction Machines of Electrical Machines

Answer 1

Right option is (a) 4*T

To explain I would say: Tst α V^2.

             T2/T1 = (2/1)^2

             T2 = 4*T1.