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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q536 - Electrical, Electronic, & Control Engineering
148. While inspecting the copper commutator bars of a DC generator, you notice a chocolate brown film covering the bars. What should be done?
A chocolate brown film on DC generator commutator bars is a normal, beneficial copper oxide layer that improves commutation and reduces wear; it should be left undisturbed.
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