Discussion
Which happens to the pull-in winding once the contacts close?
Answer: C
Both ends of the pull-in winding reach the same potential once the main contacts close, so no current flows through it. That saves a great deal of current during cranking. The hold-on winding alone keeps the plunger in place. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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