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Q#1 Transformers GATE EE 2013 MCQ +1 mark -0.33 marks

A single-phase transformer has no-load loss of 64W, 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 81W. The transformer has maximum efficiency when operated at  

50.0% of the rated current.

64.0% of the rated current.

80.0% of the rated current.

88.8% of the rated current.

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