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NEIEP Generator Maintenance And Repair (440) Practice Test

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What type of abrasive paper should be used to seat the brush to avoid conductive emery particles causing short circuits?
Correct Answer:
Sandpaper
Explanation:
When seating a brush, you want an abrasive that won’t leave behind conductive particles that could create a short path in the brush area. Sandpaper fits this need because it uses non-conductive paper backing and abrasive grains that are not intended to carry current into the commutator slots. Using emery paper risks leaving conductive emery particles in contact areas, which can lead to short circuits. The other options aren’t suitable: cardboard isn’t abrasive enough to true the seating surface, and glass paper can shed glass fragments and isn’t the proper choice for this maintenance step.

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