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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.

Q3: A. (i) Sketch a combustion gas system, suitable for inerting the cargo spaces of a vessel; (ii) Describe the operation of this system. B. State the percentage analysis by volume of the inert gas generated by the system in (A).

Q7. With reference to Keyless Propeller:

A. Sketch a section through a keyless sleeved propeller.

B. State the advantages of using a keyless sleeved propeller

C. State with reason, Which metal sleeve should be made for contact with the forged mild steel tail shaft?

D. State the material uses to bond the sleeve to the propeller and the general thickness of the bonding material.

Q2. Sketch suitable welded joints indicating the approximate plate thickness and dimensions of preparation for the following purposes - A. End plate connection to the shell of an unfired pressure vessel; B. Longitudinal seam of an unfired pressure vessel; C. Prefabricated combustion chamber for an auxiliary boiler

Q9. With reference to main boiler super heater arrangements:

A. Compare the advantages and disadvantages of contra flow with parallel flow design.

B. Describe how the element tube banks are supported yet allow for expansion.

C. Describe how boiler carryover affects super heater effectiveness and condition.

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.

Q2. With reference to the carriage and pumping of liquefied gas cargo:

A. Sketch a suitable pumping system labelling the component parts;

B. State;

i) Why submerged hydraulically driven pumps are not used;

ii) How overheating of pump drive shaft bearings is avoided;

C. State, how the risk of fire and explosion in cargo tanks is obviated both in the loaded and discharged condition.

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.

Q8. A. the UMS monitoring and control system of your ship has recently started to give false alarms and incorrect data printouts. State, with reasons, possible causes if the false alarms and reading are: I. Localized to a particular area of engine operation; ii. General to the engine room B. State, with reasons, the action you, as Second Engineer, would take to ensure continued safe operation of the vessel if the defects were general to the engine room. C. Explain the procedure you, as Second Engineer, would adopt in order to locate and rectify a general fault in the UMS system.