Discussion
Which symptom does an open hold-on winding produce?
Answer: D
With the pull-in winding shorted out and no hold-on winding, the plunger falls back, which reopens the contacts and the cycle repeats. The result is rapid chattering. A flat battery produces the same noise for a different reason. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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