Main causes of noisy solenoid are______________?
Correct answer: C. both of above
- A. strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force
- B. uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts
- C. both of above
- D. none of the above
Explanation
Solenoid noise can result from magnetic pull and repulsion that make laminations fan out, or from uneven bearing surfaces caused by dirt and wear. Since both listed faults can produce noise, the combined option is appropriate.
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