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Q4. A three-phase, 8 pole, 440 V, induction motor drives a 7 kW load at a power factor of 0.8 with a shaft speed of 14.4 rev/s and a slip of 4 %. The stator and rotational losses are 600 W and 400 W respectively.

(a) Determine EACH of the following:

(i) The supply frequency;a (4)

(ii) The frequency of the rotor emf;(2)

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

(iv) The supply current. (2)

(b) Insert the power values on the power-flow diagram in Worksheet Q4. (4)