Discussion
Sparking at a machine's brushes is classified by
Answer: C
Correct answer: its visible degree, from none to heavy with burning
Sparking is graded by inspection, from none through pin-point sparking at part of the brush edge, to sparking at the whole edge, to heavy sparking with visible burning and blackening. The first two grades are acceptable in continuous service; the last two are not and call for investigation.
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