Question

For a progressive wave winding Yc = ______

(a) 2C/P

(b) 2(C+1)/P

(c) 2(C-1)/P

(d) 2C/(P+1)

I got this question in an interview for internship.

My question is from Wave Winding topic in chapter Armature Windings of DC Machines

Answer 1

Correct choice is (b) 2(C+1)/P

Easy explanation: Starting at segment 1 and after going through P/2 coils or Yc (P/2) segments, the winding should end in segment 2 for progressive winding or segment (C) for retrogressive winding. That is mathematically,

Yc (P/2) = (C+1)

 Yc = 2(C+1)/P