Q9. (a) Explain why it is necessary to provide reverse power protection for a.c. generators operating in parallel. (2)
(b) Sketch a generator protecting circuit. (5)
(c) Explain how to check the operation of the reverse power trip. (3)
Q9. Describe, with the aid of a circuit diagram, the operation of an automatic voltage regulator (AVR) which employs the use of thyristors. (10)
Q11. (a) Explain the principle of operation of an insulation resistance test, stating why the test is carried out on a regular basis. (6)
(b) Describe how EACH of the following electrical tests is carried out:
(i) resistance; (2)
(ii) continuity. (2)
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