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What is Commutator?

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What is Commutator?

(a) rotating segment to which brushes are attached

(b) stationary segment to which rotating brushes are attached

(c) rotating segment to which rotating brush segment is attached

(d) any of the mentioned

This question was posed to me during an internship interview.

My question is from Action of Commutator in chapter Electrical Machine Applications/Armature Reaction and Commutation of Electrical Machines

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The correct choice is (a) rotating segment to which brushes are attached

Easiest explanation: Commutator is a rotating segment to which brushes are attached.

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