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Ranking the single-phase types by starting torque, from smallest to largest, gives

  • A.split phase, shaded pole, capacitor start, permanent split capacitor
  • B.permanent split capacitor, capacitor start, shaded pole, split phase
  • C.shaded pole, permanent split capacitor, split phase, capacitor start
  • D.capacitor start, split phase, permanent split capacitor, shaded pole

Answer: C

Starting torque follows how nearly circular the starting field can be made, and the capacitor start arrangement comes closest to quadrature. Cost and complexity run in the same order, which is why all four types survive in the market.

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