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Q9. A. Describe, with the aid of a sketch, a system for burning gaseous fuel in a two-stroke diesel engine, indicating safety features fitted and explaining why the gas has to be injected into the cylinder rather than mixed with the combustion air outside of the cylinders. (12)

B. Define the term Methane Slip, explaining how it occurs and why it is undesirable. (4)

Q1. As Chief Engineer Officer, write a report to the engineering superintendent regarding the failure of a main engine cylinder liner due to cracking which resulted in water leakage from the cooling space into the cylinder. The report must explain how the defect was detected, the immediate action taken, the rectifying action taken to ensure that the engine could be operated, and the checks made on the engine before and after restarting. (16)

Q2. With reference to failure of fuel injector nozzles due to burning:

(a) state, with reasons, THREE possible causes; (6)

(b) write a procedure to be used when investigating the cause of fuel injector nozzle burning; (6)

(c) describe a system which should be operated in order to minimise the risk of future fuel injector nozzle burning. (4)

Q4. With reference to diesel engine starting air systems:

(a) write instructions for the checking of the starting air system in order to determine the reason for an engine failing to turn over when the starting air system is activated; (6)

(b) Describe the procedure for checking and preparing a starting air receiver for survey; (6)

(c) Explain why cooling is required between the compressor stages and after the final stage, stating the arrangement used for draining condensate from the coolers. (4)

Q5. (a) Describe, with the aid of a sketch, a diesel engine air start system and the devices which are fitted to prevent or limit damage in the event of an explosion. (8)

(b) Explain how an explosion in a diesel engine air start system might occur. (4)

(c) As Chief Engineer Officer, outline the actions that should be taken to ensure that an explosion from the causes explained in part (b) may be avoided. (4)

Q3. With reference to crankcase lubricating oil:

(a) Describe the causes and effects of bacterial attack; (6)

(b) Explain how bacterial attack may be detected; (4)

(c) Describe how a crankcase lubricating oil system may be returned to service following bacterial attack. (6)

Q7. With reference to slow speed diesel engine turbocharging:

(a) explain why water separators are fitted; (4)

(b) describe how an engine may be operated in the event of a charge air cooler being damaged beyond immediate repair; (6)

(c) describe how an engine may be operated in the event of a turbocharger bearing failure which cannot be repaired immediately. (6)

Q6. (a) Write the Chief Engineer Officer's Standing Instructions for the actions to be taken by the watch keeping engineer in the event of failure of the engine room monitoring and alarm system. (8)

(b) State the procedure to be followed in the event of repeated activation of an oil mist fault alarm. (8)

Q8. (a) Write the Chief Engineer Officer's Standing Instructions for the actions to be taken by the watchkeeping engineer in the event of failure of the engine room monitoring and alarm system. (8)

(b) State the procedure to be followed in the event of repeated activation of an oil mist detector alarm. (8)

Q4. With reference to diesel engine SOx exhaust gas cleaning and pollution control:

(a) state, with reasons, which system parameters are monitored, explaining where the monitoring devices are located, how the data is stored and how data is made available. to regulatory authorities. (10)

(b) state how pollution of sea water can be caused by the use of SOx exhaust gas cleaning systems, explaining how such pollution is prevented. (6)