Compute efficiency of transformer in power factor lagging, Electrical Engineering

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Q. A 10-kVA, 200:400-V, single-phase transformer gave these test results:

• Open-circuit test (LVwinding supplied): 200V, 3.2 A, 450 W

• Short-circuit test (HV winding supplied): 38 V, 25 A, 600 W

Compute the efficiency when the transformer delivers half its rated kVA at 0.85 power factor lagging.


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