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A 200V dc machine has 4 poles and 40 coils, having simplex lap winding. The number of commutator segments which required in the given machine will be?

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A 200V dc machine has 4 poles and 40 coils, having simplex lap winding. The number of commutator segments which required in the given machine will be?

(a) 40

(b) 20

(c) 80

(d) 26

This question was addressed to me in semester exam.

This intriguing question comes from Armature Windings topic in section Armature Windings of Electrical Machines

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The correct option is (a) 40

The explanation is: It is a simplex winding and so one segment of commutator will be needed for each coil.

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