The following readings were obtained on O. C and S. C tests on a single phase, 4 kVA, 400/200V transformer.

The following readings were obtained on O. C and S. C tests on a single phase, 4 kVA, 400/200V transformer. 0.C. test (LV Side): 200V, 1A, 64W S. C. test (HV Side): 15V, 10A, 80W Determine the efficiency at full load at 0.8PF lagging. ? .​

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