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Q6. A 6 pole 3 phase squirrel cage induction motor runs on 380 V 60 Hz supply.

It draws a line current of 80 A at a power factor of 0.8 lag.

The shaft speed is 19 rev/sec.

If 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 as a per unit value;(3)

(b) The rotor copper loss; (5)

(c) The shaft output power; (5)

(d) The efficiency. (3)