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An open circuit test on a transformer is performed with

  • A.rated current in one winding and the other short circuited
  • B.both windings open circuited and no supply applied
  • C.half rated voltage applied and the other winding shorted
  • D.rated voltage applied to one winding and the other open

Answer: D

It is normally done from the low-voltage side for convenience, and the wattmeter reads the core loss because the copper loss at no-load current is negligible. The magnetising branch parameters follow from the same readings.

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