Question

A three phase induction motor is connected to the infinite bus operating at the normal conditions. There occurs an unbalancing in the supply, leading to ____________

(a) unequal heating losses

(b) stopping of motor

(c) increase in lower

(d) none of the mentioned

This question was posed to me at a job interview.

Asked question is from Cooling (Loss Dissipation) in portion Rating and Loss Dissipation of Electrical Machines

Answer 1

Right answer is (a) unequal heating losses

To elaborate: The unbalancing in the supply phase will create an unbalanced distribution of the current in the phases, thereby unequal heating.