Compute efficiency of 4 hours full load at 0.8 power factor, Electrical Engineering

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Q. A 10-kVA transformer is known to have an iron loss of 150 W and a full-load copper loss of 250 W. If the transformer has the following load cycle, compute its all-day efficiency:

4 hours full load at 0.8 power factor

8 hours 75% full load at 1.0 power factor

12 hours 50% full load at 0.6 power factor


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