Question

What is the relation between motors and ratio of core length to pole pitch?

(a) for small motors high ratio is preferred

(b) for big motors high ratio is preferred

(c) for small motors small ratio is preferred

(d) for big motors small ratio is preferred

I have been asked this question in quiz.

Asked question is from Main Dimensions in portion Three Phase Induction Motor of Design of Electrical Machines

Answer 1

The correct option is (c) for small motors small ratio is preferred

The best I can explain: For small motors, high values of the ratio of core length to pole pitch which may not be able to accommodate even a small amount of slots. Thus small motors prefer only small ratio to accommodate slots.