Engine : Electricity - 280/1386
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| What should be included in performing proper maintenance of a D.C. motor's commutator? |
| A) painting the face of the commutator with insulating varnish |
| B) baking the armature in an oven at 350°C for 8 hours annually |
| C) coating the copper surface with light machine oil for the first four hours of operation |
| D) side-cutting the copper segments and undercutting the mica |
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