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The no-load current of a transformer consists of

  • A.the leakage current through the winding insulation
  • B.a magnetising component and a core loss component
  • C.a resistive component and a load component
  • D.the secondary current referred to the primary alone

Answer: B

One part in quadrature with the voltage establishes the flux, and a small part in phase with it supplies the hysteresis and eddy current loss. Together they amount to a few per cent of rated current in a power transformer.

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