Q4. During routine soundings, it is found that leakage into a cofferdam is occurring from an adjacent deep cargo oil tank. As Second Engineer state the procedure for directing safe entry by the engine room staff to ascertain the cause of the leakage. If the leakage persists, discuss EACH of the following options as a possible remedy: i) Leave the cofferdam to flood with oil (ii) Flood the cofferdam with sea water (iii) Seal the Cofferdam and pressurize with air (iv) Pump the leakage to bunker tanks.
Q2. A. Describe the procedure to be adopted for the inspection of a safety valve fitted to an exhaust gas fired auxiliary boiler stating, with reasons, which parts should receive particularly close attention.
B. Describe the procedure for the setting of safety valves of exhaust gas operated auxiliary boilers;
C. Explain the required action a watch-keeping engineer should take after the setting of safety valves as in (B)
Q6. With reference to hydraulic system for deck machinery identify: A. The types of contamination likely to be found in hydraulic systems for deck machinery; B. The sources of such impurities; C. Means used to prevent problems with contamination; D. Possible effects of the oil contamination on the system.
Q6. With reference to electro-hydraulic steering gears:
A. Explain in terms of control parlance, the function of the “Hunting gear”;
B. Explain the consequences if the standby pumping unit is motored;
C. State TWO methods employed to prevent the standby hydraulic pump being motored by the operating unit.
Q6. A. Explain how and why the performance of reciprocating air compressor tends to “fall off” in service. B. State how “fall off” is indicated and to what extent permissible before correction; C. Describe how optimum performance is restored; D. What is the significance of clearance volume: for reciprocating air compressors.
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.
Q5. A. State why fixed pitch propellers have a poor efficiency when going astern.
B. With reference to controllable pitch propellers state:
i. Why is it preferable that the main servomotor be housed in the propeller hub rather than in the shafting forward of the propeller shaft?
ii. What regular maintenance and checks should be carried out to ensure maximum reliability of the gear at all times?
Q8. Describe how the following conditions can be avoided in auxiliary boilers - A. Furnace distortion; B. Uptake fires; C. Difficulty in maintaining normal water level.
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.
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