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A 400 KVA transformer has a primary winding resistance of 0.50 and a secondary winding resistance of 0.0010. The iron loss is 2.5kW and

A 400 KVA transformer has a primary winding resistance of 0.50 and a secondary winding resistance of 0.0010. The iron loss is 2.5kW and the primary and secondary voltages are 5 kV and 320V,respectively. If the power factor of the load is 0.85, determine the efficiency of the transformer on full load.

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