Discussion
Which fault does continuity between a commutator segment and the shaft indicate?
Answer: B
Any continuity to the shaft means the insulation has broken down and the armature is scrap. The winding is never intentionally connected to the shaft. Distinguishing an earth from a short is fundamental to armature testing. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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