Q9. Give reasons why each of the following features is considered desirable in air compressors. A. Smooth air passages with minimum obstruction at valves; B. Minimum clearance volume C. Multi-tubular heat exchangers; D. Generous size of suction filter.
Q3. A. Sketch and describe TWO methods that employ manometric means for measuring tank contents. (6)
B. State what corrections are made to the readings obtained by the methods described in (A) in order to gauge the mass contents? (5)
C. Explain how bunkering requirements may be estimated when no records of main engine fuel consumption are available on board. (5)
Q4. A. Describe with the aid of sketches where necessary a vane type steering gear showing how to weight of the rudder and stock are carried and the arrangement that allow for wear down;
B. State how the vanes described in (A) are secured and the method of sealing the edges;
C. State how, if necessary, the steering gear is locked for rudder maintenance.
Q8. With reference to oil/water separators:
A. Describe with the aid of a sketch, the working of such a separator. (6)
B. Explain the consequence if the interface detector position is incorrect. (5)
C. Enumerate the various possibilities by which oil / water interface can be moved. (6)
Q5.A. Sketch a watertight door and frame showing the manner of attachment to the bulkhead and the additional reinforcement carried by the bulkhead to compensate for the aperture.
B. Explain how water tightness of the door and frame mating surfaces is ensured with hydrostatic pressure tending to force the faces apart.
C. (i) Describe the means of closing the door;
(ii) State the number of closing stations and the position of each.
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