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Q4. A three-phase, star-connected., eight-pole induction motor runs on a 415 V, 50 Hz power supply. The stator resistance is 0.1 Ω per phase, the rotational losses ( windage and friction) are 1 kW, the speed is 12 rev/s and the shaft output power is 24 kW.

If the input current is 57 A at a lagging power factor of 0.707, calculate EACH of the following:

(a) The output torque; (2)

(b) The rotor copper losses; (5)

(c) The stator copper losses; (2)

(d) The stator iron losses; (5)

(e) The efficiency. (2)