Discussion
Blackening of a commutator at intervals of the pole pitch suggests
Answer: A
Correct answer: a fault in the armature winding at that spacing
Marking that repeats at the pole pitch corresponds to particular coils rather than to a general condition, since those are the coils commutating at the same points. It therefore points at the winding - a high-resistance joint at the riser, or a shorted turn - rather than at the brushes or the interpoles, which would mark uniformly.
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