Discussion
A synchronous motor is unsuitable for a load requiring frequent starts because
Answer: C
Correct answer: each start is a lengthy and thermally severe operation
Starting means accelerating on the damper winding, which is not designed for continuous duty, and then applying the field at the right moment. The sequence takes time and heats the damper heavily, so a machine started many times an hour would overheat. Loads with frequent starts are given induction machines.
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