Q9. With reference to main A.C. generators:
a) state the immediate and subsequent actions to be taken in the event of a high windings temperature alarm being activated. (8)
b) state the feature of the windings cooler tubes that prevent damage to the windings in the event of leakage. (2)
Q10. With reference to overload protection for electric motors, describe the principle of operation of EACH of the following types of overload relay.
(a) Thermal (3)
(b) Magnetic (3)
(c) Electronic (4)
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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