Discussion
Over-commutation, from too strong an interpole flux, causes sparking at
Answer: A
Correct answer: the leading edge of the brush
Too strong an interpole reverses the current early, so a reverse current is already established while the brush is still making contact. The excess must then discharge at the leading edge. It is the less common fault, since interpoles are usually set weak rather than strong, but it points to the opposite adjustment.
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