Q12. With reference to double-bottom fuel tanks:
(a) explain why weighted cocks are fitted to the tank-sounding pipes. (2)
(b) explain the purpose of air pipes. (2)
(c) state the design features incorporated on air pipe vents with respect to EACH of the following:
(i) heavy weather; (2)
(ii) fire; (2)
(iii) bunkering. (2)
Q13. (a) With reference to bilge keels:
(i) describe how the design and method of attachment reduces the possibility of damage to the shell plate; (5)
(ii) state what testing must be carried out. (2)
(b) Explain why the bilge keels do not extend the full length of the vessel. (3)
Q14. With reference to large fixed bladed propellers:
(a) Describe, with the aid of a sketch, EACH of the following:
(i) The effect of hull fouling; (3)
(ii) Operation in clean hull, ballast condition. (3)
(b) Explain why fitting a light propeller may be beneficial. (4)
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