Question

In wave winding, P/2 coils are connected under the influence of “x” pole-pairs which connect adjacent segments. X is ____

(a) P

(b) P/2

(c) 2P

(d) P/4

This question was addressed to me during a job interview.

The query is from Commutation Process topic in portion Commutation Process & Excitation Methods of DC Machines

Answer 1

The correct answer is (b) P/2

Easy explanation: One coil each under an adjoining pole-pair is connected between adjacent commutator segments in a lap wound DC armature, while in a wave-wound armature the only difference is that P/2 coils under the influence of P/2 pole-pairs are connected between adjacent segments.