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The auxiliary winding of a split-phase motor is disconnected once the machine reaches speed by

  • A.a thermal relay in the main winding circuit
  • B.a capacitor that blocks the current at running speed
  • C.the rotor itself
  • D.a centrifugal switch on the shaft

Answer: D

The winding is wound with fine wire and would burn out if left in circuit, so a switch releases at around three quarters of synchronous speed. Failure of that switch to open is a common cause of burnt-out auxiliary windings.

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