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Q3. A 440 V/ 110 V single phase transformer takes a no load current of 5 A at power factor 0.25 lag. On load the transformer supplies 7.5 kVA at power factor 0.8 lag. Calculate EACH of the following:

(a) The transformer secondary current;

(b) The transformer primary current;

(c) The primary power factor;

(d) The efficiency of the transformer at this load.