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A transformer having maximum efficiency at 75% full load will have ratio of iron loss and full load copper loss equal to ___________

A transformer having maximum efficiency at 75% full load will have ratio of iron loss and full load copper loss equal to ___________ Correct Answer 9/16

Condition for maximum efficiency is, Copper loss= Iron loss, i.e. Pc= I2 R = Pi. transformer can be operated at any load but maximum efficiency occurs at a particular load condition only. Let x be that load factor corresponds to maximum efficiency. Given that, maximum efficiency will occur at 3/4 load. The load factor= (3/4)2.

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