In a universal motor, the most common cause of brush sparking is___________?
Correct answer: E. all of the above
- A. open armature winding
- B. shorted armature winding
- C. shorted field winding"
- D. high commutator mica
- E. all of the above
Explanation
Brush sparking in a universal motor can result from armature winding faults, field winding faults, or high commutator mica that prevents proper brush contact. Hence all the listed faults can produce sparking.
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