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The no-load current of an induction motor is largely

  • A.zero
  • B.at the slip frequency rather than the supply frequency
  • C.magnetising and therefore reactive
  • D.in phase with the applied voltage and therefore real

Answer: C

Establishing the air gap flux takes reactive current whatever the load, and at no load that is nearly all the machine draws. It is typically a quarter to a third of rated current, which is why light loading gives such a poor power factor.

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