To avoid formation of grooves in the commutator of a D.C. machine
A)the brushes of opposite polarity should track each other
B)the brushes of same polarity should track each other
C)brush position has no effect on the commutator grooving

Question

Quizplus · Accepted Answer

The brushes of opposite polarity should track each other to avoid formation of grooves in the commutator of a D.C. machine. This is because when the brushes of opposite polarity track each other, the current flowing through the commutator is evenly distributed, which prevents the formation of grooves.

To Avoid Formation of Grooves in the Commutator of a D.C