engineering recuitment JSSC JE Mock Test 2023 Electrical Machines Transformer

A 40-kVA transformer has iron loss of 450 W and full-load Copper loss of 850 W. If the power factor of the load is 0.8 lagging. The full-load efficiency of the transformer is:

1
85.20%
2
96.10%
3
78.50%
4
91.20%
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