Q11. With reference to electrical short-circuits: (a) state, with reasons, THREE factors that will influence the severity of a short circuit; (6)
(b) explain the role of reactance when selecting protective devices. (4)
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)
Q9. Describe, with the aid of a diagram, a shaft generator that uses a frequency converter. (10)
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