In a DC machine, the sparking between brushes and commutator surface may be due to
A. under commutation.
B. over commutation.
C. too rapid reversal of current.
D. any of the above.
Answer:D
In a DC machine, the sparking between brushes and commutator surface may be due to
A. under commutation. B. over commutation. C. too rapid reversal of current. D. any of the above.