Engine : Electricity - 282/1386
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| For routine cleaning of a commutator, what should be applied? |
| A) a fine tooth file to the commutator while running |
| B) a canvas wiper on the commutator while running |
| C) an emery cloth parallel to the axis of the commutator |
| D) course sandpaper in a slow back and forth motion across the commutator slots |
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