Q11. Explain the meaning of EACH of the following types of electrical equipment:
(i) intrinsically safe; (2) (ii) flameproof; (2) (iii) increased safety; (2)
(iv) pressurised enclosure. (2)
(b) State TWO types of lighting equipment that may be installed in the pump room areas of a crude petroleum carrier. (2)
Q9. With reference to voltage variation profiles caused by load changes imposed on alternating current generators when starting large motors online:
(a) sketch a voltage dip, showing an acceptable recovery time; (2)
(b) state FOUR salient factors that cause the variation in part (a); (4)
(c) outline FOUR salient factors that assist recovery from the deviation shown in part (a). (4)
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