Question

How many types of losses are present in synchronous machines?

(a) 7

(b) 3

(c) 4

(d) 5

I got this question in an internship interview.

Enquiry is from Losses and Temperature Rise in chapter Design of Synchronous Machines of Design of Electrical Machines

Answer 1

The correct option is (a) 7

To explain I would say: There are 7 losses in the synchronous machines. They are i) iron loss due to main field, ii) iron loss due to parasitic field, iii) I2R loss in the armature winding, iv) eddy current loss in armature conductors, v) stray load loss, vi) loss in field windings, vii) friction and windage loss.