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As the armature rotates, the number of coils in series tapped by the brush pairs_________

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As the armature rotates, the number of coils in series tapped by the brush pairs_________

(a) Remains same

(b) Increases

(c) Decreases

(d) Depends on rotor speed and direction of torque

This question was addressed to me in exam.

This is a very interesting question from Armature Winding and Commutator in division Armature Windings of DC Machines

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The correct choice is (a) Remains same

The explanation is: Brushes are located electrically in magnetically neutral region. Adjoining brush pairs are at constant DC voltage and the number of coils tapped by brush pairs also remain constant. Their disposition relative to the poles is the same.

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