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The capacitor used for starting in a capacitor start motor is

  • A.not a capacitor at all but an inductor in series
  • B.an electrolytic type rated for intermittent duty
  • C.an oil-filled type rated for continuous duty
  • D.a variable air-dielectric type adjusted at each start

Answer: B

Correct answer: an electrolytic type rated for intermittent duty

A start capacitor needs a large capacitance in a small volume and is in circuit only for a second or two at each start, so an electrolytic type is used. It cannot carry current continuously without overheating, which is precisely why the centrifugal switch must disconnect it once the machine is up to speed.

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