Q9. (a)Sketch a circuit diagram of a self-excited a.c. generator.(5)
(b)Describe the operation of the circuit sketched in part (a).(5)
Q10.During a complete loss of electrical power, essential vital services can be maintained by means of an Uninterruptable Power Supply (UPS).
(a)Describe, with the aid of a block diagram, the operation of an a.c. input UPS arrangement. (7)
(b)List SIX essential services that the UPS may support. (3)
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)
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)
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