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)
Q9. (a) Describe, with the aid of a sketch, the constructional details of a squirrel cage rotor as fitted in an induction motor (7)
(b) Explain why some rotors have a double cage. (3)
Q11. With reference to testing High Voltage equipment:
(a) explain why earthing down is considered essential; (2)
(b) state the operating voltage for an insulation resistance tester (megger) suitable for 6.6 KV equipment; (1)
(c) describe how an insulation resistance test is carried out on High Voltage equipment, making reference to personnel safety; (5)
(d) explain why infra red temperature measurement is used on High Voltage equipment. (2)
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