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Q9. A. List the factors that determine the starting torque of the three-phase induction motor. How does this torque generally compare with the value of the rated torque? (6)

B. A 3 ph 440 V, 60 Hz, 8 pole induction motor runs at a power factor of 0.85 lag and drives a load of 8 kW at a speed of 14.4 rev/s. The stator loss is 1 kW and the rotation losses (windage and friction) amount to 0.8 kW. Calculate EACH of the following:

(a) The synchronous speed.

(b) The rotor copper loss.

(c) The input power to the motor.

(d) The motor current. (10)