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A single-phase motor that trips its thermal protection repeatedly is most likely

  • A.running at exactly synchronous speed under load
  • B.drawing no current at all from its supply
  • C.failing to start, or starting against too heavy a load
  • D.running with an excellent power factor and low current

Answer: C

Locked rotor current for a few seconds heats the winding quickly, so repeated tripping points to a starting failure or a mechanical obstruction. Checking the capacitor and turning the shaft by hand are the first two tests.

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