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A single-phase induction motor whose centrifugal switch fails to open will

  • A.run at exactly synchronous speed
  • B.draw no current from the supply
  • C.burn out its auxiliary winding
  • D.fail to start from rest at all

Answer: C

The auxiliary winding and the starting capacitor are both rated for a second or two of duty, and leaving them in circuit destroys them within minutes. A burnt auxiliary winding with a good main winding is the classic symptom of that fault.

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