Q9. Describe the construction and operation of EACH of the following:
(a) Synchronous motor (5) (b) Induction motor. (5)
Q10. With reference to a.c switchboards:
(a) State with reasons, the protective devices that are fitted; (5)
(b) state why a breaker may fail to open under prolonged low voltage conditions. (2)
(c) explain the actions to be taken should a main generator circuit breaker stay connected despite repeated efforts to trip it off the board. (3)
Q11. (a) Sketch a circuit diagram of an emergency generator power supply and distribution system, indicating the essential services provided at 440 volts ac, 220 volts ac and 24 volts dc. (6)
(b) State the regulation pertaining to the emergency generator. (4)
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