Exam Question

A 100 KVA, 2400/240 V, 50 H, 1-phase transformer has no-load current of 0.64 A and a core loss of 700 W, when its high voltage side is energised at rated voltage and frequency. Calculate the two components of no-load current. If this transformer supplies a load current of 40 amp at 0.8 lagging power factor at its low voltage side, determine the primary current and its power factor. Ignore leakage impedance drop. (16)