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Q4. A three phase , 6 pole, 380 V, 60 Hz induction motor has a line current of 80 A at a power factor of 0.8 lag with a shaft speed of 19 rev/s. The iron losses are 2 kW, the stator copper loss is 1 kW and the windage and friction loss is 1.5 kW.

Calculate EACH of the following;

(a) The slip; (3)

(b) The rotor copper loss; (5)

(c) The shaft output power; (5)

(d) The efficiency. (3)