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Q7. (a) Sketch and label the V/I characteristics of a three-phase generator operating at constant speed with EACH of the following load power factors:

(i) unity; (2)

(ii) 0.8 lagging; (2)

(iii) 0.8 leading. (2)

(b) Explain why it is recommended that two identical A.C. generators running in parallel should operate at similar power factors. (5)

(c) Explain how the power factor of paralled A.C. generators may be altered independently of the ship's load power factor. (5)