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 torqueThis 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

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

1.	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 torqueThis 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
Answer» 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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