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DC machines have ________ windings and synchronous machines use ______ windings.

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DC machines have ________ windings and synchronous machines use ______ windings.

(a) closed,open

(b) open, closed

(c) open, open

(d) closed, closed

The question was asked in semester exam.

I'd like to ask this question from Armature Windings topic in division Armature Windings of Electrical Machines

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Right answer is (a) closed,open

To explain I would say: All the commutator machines use closed winding as it has nothing to deal with reactance. In ac machines, the winding can be converted

             to star to delta and vice versa.

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