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Q7. With reference to an automatic voltage regulator (AVR) for ship’s a.c. generators:

(a) Explain why it is needed; (3)

(b) State the acceptable performance limits following a 15 % voltage dip; (2)

(c) Sketch a clearly labelled block diagram; (6)

(d) Describe the operation of the block diagram sketched in Q7 (c). (5)