Discussion
In carrying out the test that yields the copper loss, the engineer applies
Answer: A
Correct answer: reduced voltage giving rated current in the shorted winding
In the short circuit test one winding is shorted and the applied voltage raised only until rated current flows - a few per cent of rated voltage. The flux, and therefore the core loss, is negligible at that voltage, so the wattmeter reads essentially the full-load copper loss, and the readings also give the equivalent series impedance.
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