Question

What all factors does the heat to be dissipated by cooling surfaces depend upon?

(a) hysteresis loss

(b) eddy current loss

(c) heating loss

(d) hysteresis, eddy and heating losses

I had been asked this question by my college director while I was bunking the class.

My question is taken from Losses and Temperature Rise in chapter Design of Synchronous Machines of Design of Electrical Machines

Answer 1

The correct answer is (d) hysteresis, eddy and heating losses

To elaborate: The heat to be dissipated by the cooling surface of the armature core would consist of the hysteresis loss and the eddy current loss. It also consists of the heating loss or the I2R in the active part of the armature.