Question

Operation of a dc machine will ________

(a) not be affected by commutating poles

(b) be affected by commutating poles

(c) be affected significantly upto 30% spread of commutating poles

(d) none of the mentioned

This question was addressed to me in an interview for internship.

The origin of the question is Action of Commutator topic in section Electrical Machine Applications/Armature Reaction and Commutation of Electrical Machines

Answer 1

The correct option is (a) not be affected by commutating poles

The explanation: Commutating poles are placed under the armature poles and it compensates only poles under these regions.