Q9. Describe, with the aid of a black diagram, how automatic starting load sharing and stopping of generators in response to load changes is effected. (10)
Q10. With reference to star delta starters used for three phase induction motors;
(a) explain in detail why this type of starter is employed. (4)
(b) explain, with the aid of a circuit diagram, the sequence of operation of a star delta starter. (6)
Q11. With reference to electrical system protective devices, explain the purpose of EACH of the following;
(a) overcurrent protection (2) (b) Short circuit protection (2)
(c) No-volt protection (2) (d) Reverse power protection (2)
(e) Preferential tripping (2)
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