Q7. A rudder of a vessel requires extensive welding repairs and as Second Engineer you are requested to supervise the repairs.
A. Suggest a suitable type of welding process;
B. State, with reasons, FOUR common welding defects.
C. State what tests may be carried out before returning the rudder to service.
Q8. A. Explain the action of EACH of the following metallurgical mechanism:
(i) Creep; (ii) Brinelling; (iii) Fretting; (iv) Fretting corrosion;
B .State, with reasons, where EACH of the mechanisms in occur in ship propulsion System.
Q9. Reverse osmosis is one of the alternative method for shipboard production of drinking water.
(a) Describe using simple diagrams if necessary, the principle of reverse osmosis.
(b) (i) Sketch a line diagram showing a single pass system for producing fresh water from sea water
(ii) Describe such a system.
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