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Q3. A THREE-phase, 440 V, 60 Hz shaft generator supplies the following loads.

• induction motors    200 kW, 0. 7 lag

• fluorescent lighting          14 kVA, 0.86 lag

• incandescent lighting       5 kW, u.p.f.

• navigation aids                27 A, 0.9 lag

(a) Calculate EACH of the following:

(i) the total active power supplied. (4)

(ii) the generator power factor. (6)

(b) A THREE-phase synchronous motor is connected to the supply to raise the generator power factor to unity. The synchronous motor has an input power of 50 kW.

Calculate EACH of the following for the synchronous motor:

(i) the power factor; (4)

(ii) the current. (2)