Q11. With reference to electrical equipment in potentially flammable atmosphere:
(a) Explain why conventional equipment is considered hazardous (2)
(b) Explain the concept of intrinsic safety (3)
(c) Describe, with the aid of a sketch, a safety barrier for an electrical power supply (5)
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)
Q5. With reference to the protection of electrical equipment in a distribution system:
(a) state the aims of the protective devices; (3)
(b) list the parameters that are monitored and acted upon by the protective devices; (4)
(c) state, with reasons, THREE causes of electrical fires. (3)
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