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The efficiency of a shaded pole motor is low because

  • A.the stator winding carries no current when running
  • B.the shading rings dissipate power continuously
  • C.the rotor has no conductors in its slots at all
  • D.the machine runs at exactly synchronous speed

Answer: B

Current circulates in the rings whenever the machine is energised, and the field it produces is useful only for starting. Efficiencies of twenty per cent or less are normal, which is acceptable only in very small machines.

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