McqMate
| Q. |
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» A. the brushes of opposite polarity should track each other | |
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