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3 (4 Marks): A 500-kVA, 3-phase, 50-Hz transformer has a voltage ratio (line voltages) of 33/11-kV and is delta/star connected. The resistances per phase are:

3 (4 Marks): A 500-kVA, 3-phase, 50-Hz transformer has a voltage ratio (line voltages) of 33/11-kV and is delta/star connected. The resistances per phase are: high voltage 35 92, low voltage 0.876 2 and the iron loss is 3050 W. Calculate the value of efficiency at full-load and one-half of full load respectively (a) at unity p.f. and (b) 0.8 p.f

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