Question

In the 3-phase induction motor developed torque during plugging is ______ mechanical power developed in the braking region of the induction motor is ______

(a) positive, negative

(b) negative, positive

(c) positive, positive

(d) negative, negative

I had been asked this question at a job interview.

My doubt is from Analysis of the Equivalent Circuit topic in portion Induction Machines of Electrical Machines

Answer 1

Right option is (a) positive, negative

For explanation: Tem is positive while Pm will be negative in braking or plugging operation.