Q9. With reference to overcurrent protection for electrical circuits:
(a) Explain THREE methods of protection, stating where EACH may be used; (6)
(b) explain, with the aid of a diagram, the meaning of the term inverse current time characteristic. (4)
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)
Q11. With reference to the protection of electrical power circuits:
(a) explain discrimination, describing how it is achieved. (5)
(b) state, with reasons, the type of fuses used for protection; (3)
(c) explain preferential tripping. (2)
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