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The efficiency of a transformer can be calculated accurately from ___________

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The efficiency of a transformer can be calculated accurately from ___________

(a) Open circuit test, Short circuit test

(b) Open circuit test, Short circuit test, Sumpner’s test

(c) Sumpner’s test

(d) load test

The question was asked by my college director while I was bunking the class.

I'm obligated to ask this question of Transformer Losses and Efficiency topic in chapter Transformers of Electrical Machines

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Right answer is (a) Open circuit test, Short circuit test

The best I can explain: OC and SC tests together can help to estimate the most correct value of the efficiency for the given transformer.

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