Discussion
Which fault results from a worn starter bush?
Answer: D
Clearance lets the armature drop onto the field poles, which brakes it and draws excessive current. Uneven commutator wear genuinely follows as well, which makes the last option a real consequence of the same wear. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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