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A shaded pole motor produces its starting torque from

  • A.a copper ring around part of each pole face
  • B.an auxiliary winding with a series capacitor
  • C.a centrifugal switch on the rotor shaft
  • D.a commutator with brushes on the rotor

Answer: A

The ring delays the flux in the part of the pole it encircles, which gives a weak sweeping motion of the field across the pole face. Efficiency and starting torque are both poor, but the machine is extremely cheap and is used in fractional-horsepower duties.

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