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Q4. A three phase, four pole induction motor runs on a 440 V, 50 Hz supply. It delivers a shaft output power of 50 kW. The rotational losses (windage and friction) amount to 4 kW and the speed is 24 rev/s.

If the input current is 120 A at a lagging power factor of 0.7 and the stator copper loss is 3 kW, calculate EACH of the following:

(a) The rotor copper loss; (6)

(b) The stator iron loss; (6)

(c) The efficiency. (4)