To avoid formation of grooves in the commutator of a D.C. machine – McqOptions

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1.	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
Answer» B. the brushes of same polarity should track each other

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