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Q4.  A three-phase, 440 V, 60 Hz, 6 pole induction motor runs at a power factor of 0.82 lag and drives a load of 11 kW at a speed of 19.6 rev/s. The stator loss is 1.3 kW and the rotational losses (windage and friction) amount to 1.0 kW.

Calculate EACH of the following:

(a) The synchronous speed; (3)

(b) The rotor copper loss; (6)

(c) The input power to the motor; (4)

(d) The motor current. (3)