Question

What is the range of the pole face loss in the synchronous machines?

(a) 40-60 % of iron loss

(b) 20-60 % of iron loss

(c) 25-70 % of iron loss

(d) 40-80 % of iron loss

I had been asked this question in final exam.

This question is from Losses and Temperature Rise in portion Design of Synchronous Machines of Design of Electrical Machines

Answer 1

The correct answer is (c) 25-70 % of iron loss

The explanation is: The pole face loss has a minimum value of 25% of the iron loss. The pole face loss has a maximum value of 70% of the iron loss.