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. With reference to large electrical transformers on board ships:
(a) state where these transformers may be used; (1)
(b) state a typical efficiency range for a transformer; (1)
(c) state the regulations pertaining to transformers; (3)
(d) state the protective devices that are fitted; (2)
(e) describe the maintenance requirements. (3)
Q11. (a) With reference to an alkaline battery cell:
(i) describe a typical cell, stating the materials used; (4)
(ii) describe the electro-chemical process that takes place during discharge and charge. (2)
(iii) state the effect of overcharge. (2)
(b) State the advantages of an alkaline cell compared with a lead acid cell. (2)
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