In D.C. generators, the cause of rapid brush wear may be___________?
Correct answer: D. any of the above
- A. severe sparking
- B. rough commutator surface
- C. imperfect contact
- D. any of the above
Explanation
Severe sparking, a rough commutator surface, and imperfect brush contact can all damage the brush surface and increase wear. Thus any of the listed conditions may be responsible.
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