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)
Q10. (a) State the consequences of using direct online starters for comparatively large-sized a.c. induction motors. (2)
(b) Describe, with the aid of a sketch, an electronic soft starting system that may be used for large-sized a.c. induction motors. (8)
Q11.With reference to insulation testing of electrical equipment:
(a) With reference to insulation testing and why it is carried out on a regular basis; (2)
(b) Describe the procedure for taking a set of insulation readings on an electric motor insitu, stating the minimum acceptable readings; (6)
(c) Explain the term polarisation Index (2)
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