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The open circuit and short circuit tests on a transformer give the following losses. At what load will the efficiency of the transformer be maximum?

The open circuit and short circuit tests on a transformer give the following losses. At what load will the efficiency of the transformer be maximum? Correct Answer At load of 40 kVA - Loss on OC test: 320 W and Loss on SC test: 320 W

Concept:

The efficiency of the transformer is maximum when the copper losses will be equal to iron losses.

Open circuit test is used to find the constant losses or iron losses.

A short circuit test is used to find the variable losses or constant losses.

Application:

In the first option, the copper losses are equal to constant losses.

O.C test losses = Iron losses = 320 W

S.C test losses = Copper losses = 320 W

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