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A 200 V dc machine working at rated speed. Voltage across the commutating terminals should ideally be ________

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A 200 V dc machine working at rated speed. Voltage across the commutating terminals should ideally be ________

(a) zero

(b) 2 V

(c) 1 V

(d) 200 V

I have been asked this question by my school teacher while I was bunking the class.

This intriguing question comes from Action of Commutator in portion Electrical Machine Applications/Armature Reaction and Commutation of Electrical Machines

1 Answer

+1 vote
by (888k points)
The correct option is (a) zero

Explanation: The commutating poles undergoing commutation should have zero voltage across it so that there is no reactive voltage induced.

So it will not cause large circulating current in the winding.

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