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The open-circuit test in a transformer is used to measure:

Correct answer: D. Core loss

  • A. Copper loss
  • B. Winding loss
  • C. Total loss
  • D. Core loss

Explanation

The open-circuit test is done to find the core loss of the transformer. It is done by keeping one of the windings open (without load, usually the high voltage winding is open) and applying rated voltage to the other winding (usually the low voltage winding because it is easier to apply rated voltage).

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