A 1, 25 kVA, 220=440 V, 60 Hz transformer gave the following test results. Open circuit test (440 V side open): 220 V, 9:5 A, 650W Short-circuit test (220 V side shorted): 37:5 V, 55 A, 950W (a) Derive the approximate equivalent circuit in per-unit values. (b) Determine the voltage regulation at full load, 0.8 PF lagging. (c) Draw the phasor diagram for condition (b).

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