13. A 150 KVA single phase transformer has a core loss of 1.5 kW and a full load copper loss of 2 kW. Calculate the efficiency of the transformer i) at full-load, 0.8 p.f. lagging i at half-load, unity pf. Determine also the secondary current at which the efficiency is maximum if the secondary voltage is maintained at its rated value of 240 V.
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