Engine_2014 : Electricity - 2050/2299
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| Which of the following statements concerning the maintenance of solid-silver contacts in relays and auxiliary control circuits is correct? |
| A) When necessary, they should always be dressed with a wire wheel. |
| B) They should be filed with a fine-cut file when projections extend beyond the contact surface. |
| C) When black silver oxide is present, it should always be removed from the contact surface with coarse sandpaper. |
| D) When necessary, they should be spray painted with electrical shellac |
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