Question

Which losses can be identified from Swinburne’s test?

(a) No-load core loss

(b) Windage and friction loss

(c) No-load and windage and friction loss

(d) Stray load loss

I got this question in an internship interview.

The origin of the question is Swinburne’s Test in chapter Efficiency and Testing of DC Machines

Answer 1

Correct option is (c) No-load and windage and friction loss

To elaborate: We get total rotational losses occurring in a machine, which are equal to no-load core losses (iron + copper) and windage and friction losses. We also get shunt field losses and variable loss occurring in armature resistance.