engineering recuitment PGCIL Diploma Trainee Mock Test 2024 Electrical Machines Transformer

In which of the following cases, will the same transformer have highest efficiency?

1
Supplying rated load at 0.8 pf lagging
2
Supplying rated load at 0.8 pf leading
3
Supplying rated load at unity pf
4
Supplying 10% overload (110% rated) at 0.8 pf lagging
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