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Q7. 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 kV A at power factor 0.8 lag.

Calculate EACH of the following, for the on-load condition:

(a) The transformer secondary current;

(b) The transformer primary current;

(c) The primary power factor;

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