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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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