Question
A single-phase transformer has no-load loss of 64 W, as obtained from an open-circuit test. When a
short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV
windings, the measured loss is 81 W. The transformer has maximum efficiency when operated at
short-circuit test is performed on it with 90% of the rated currents flowing in its both LV and HV
windings, the measured loss is 81 W. The transformer has maximum efficiency when operated at
Answer: Option C
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