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A single-phase induction motor is best regarded as

  • A.an inherently unbalanced machine made to work by a starting trick
  • B.a machine identical in behaviour to a three-phase one of like rating
  • C.a synchronous machine that happens to run below synchronous speed
  • D.a machine that develops no torque at any speed at all

Answer: A

Everything about its poorer efficiency, its hum and its need for an auxiliary winding follows from the pulsating rather than revolving field. Recognising that makes the whole family of starting arrangements make sense.

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