Question

Given Z=228 conductors, number of coils C=38 for a DC machine. What is the turns/coils ratio?

(a) 4

(b) 3

(c) 7

(d) 3

I have been asked this question at a job interview.

I need to ask this question from Design of Armature topic in section Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

Answer 1

The correct answer is (d) 3

The explanation: Turns/coils = Number of armature conductors/(2*Number of coils)

Turns/coils = 228/38*2 = 3.