A single phase transformer has no load of 64 W, as obtained from an op – McqOptions

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1.	A single phase transformer has no load 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 winding. The measured loss is 81 W. The transformer has maximum efficiency when operated at:
A.	50.0% of the rated current
B.	64.0% of the rated current
C.	80.0% of the rated current
D.	88.8% of the rated current
Answer» D. 88.8% of the rated current

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