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Q6. A 60 kVA, 440 V/110 V single phase transformer has iron loss of 4 kW, and a full load copper loss of 6 kW.

Calculate EACH of the following:

(a) The kVA output at which maximum efficiency will be achieved;(8)

(b) The efficiency at 50 kW output and 0.85 power factor;(8)