Due to which of the following factors the brush wear rate is altered ?
Correct answer: E. All of the above
- A. Speed of the machine
- B. Contact pressure
- C. Surface conditions of brush and commutator
- D. Excessive sparking
- E. All of the above
Explanation
Brush wear depends on speed, contact pressure, brush and commutator surface condition, and sparking. Excessive sparking especially causes rapid wear, so all listed factors affect the rate.
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