Question

Each of the following statements regarding interpoles is true except______________________

(a) They are small yoke-fixed poles spaced in between the main poles

(b) They are connected in parallel with the armature so that they carry part of the armature current

(c) Their polarity, in the case of generators is the same as that of the main pole ahead

(d) They automatically neutralize not only reactance voltage but cross-magnetisation as well

The question was asked by my college director while I was bunking the class.

I need to ask this question from Ways to Reduce Effects of Armature Reaction topic in section Armature Reaction of DC Machines

Answer 1

Right choice is (b) They are connected in parallel with the armature so that they carry part of the armature current

Explanation: Interpoles are located in interpolar regions hence, they are called as interpoles. They are small narrow poles which speed up the commutation process (Also called commutating poles/ compoles).