Engine : Electricity - 1049/1386
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| While inspecting the copper commutator bars of a DC generator, you notice a chocolate brown film covering the bars. What should be done? |
| A) The film should be left undisturbed. |
| B) The film should be removed with fine emery cloth. |
| C) The film should be removed with fine sandpaper. |
| D) The film should be removed with emery paper. |
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