Question

What is the relation between the power factor and the air gap length?

(a) small air gap length, dispersion coefficient increases, good power factor

(b) small air gap length, dispersion coefficient decreases, bad power factor

(c) small air gap length, dispersion coefficient increases, bad power factor

(d) small air gap length, dispersion coefficient decreases, good power factor

I got this question by my college director while I was bunking the class.

The question is from Dispersion Coefficient topic in division Three Phase Induction Motor of Design of Electrical Machines

Answer 1

Right choice is (d) small air gap length, dispersion coefficient decreases, good power factor

Explanation: If the air gap length is small, the dispersion coefficient decreases. As the dispersion coefficient decreases, the power factor increases.