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Q5. A 440 V /110 V single phase step down transformer is rated at 60 kV A full load output. The iron loss is 4 kW and the copper loss at full load is 6 kW. Calculate EACH of the following:

(a) The kVA output at which maximum efficiency will be achieved;

(b) The efficiency at 50 kW output and 0.85 p.f.