The following data were obtained for a 20-kVA, 60-Hz 2400: 240-V distribution transformer tested at 60 Hz:

Question:

a. Compute the efficiency at full-load current and the rated terminal voltage at 0.8 power factor.

b. Assume that the load power factor is varied while the load current and secondary terminal voltages are held constant. Use a phasor diagram to determine the load power factor for which the regulation is greatest. What is this regulation?

Distribution
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