To avoid formation of grooves in the commutator of a D.C. machine?
Correct answer: A. the brushes of opposite polarity should track each other
- 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
- D. None
Explanation
Brushes of opposite polarity are arranged to track the same commutator path, so their combined action helps prevent uneven wear and groove formation. Brush tracking and proper brush maintenance are important for a smooth commutator surface.
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