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Q7. As Chief Engineer write instructions for the checking of the engine Slow Turning System and subsequent monitoring of the engine Slow Turning System. The instruction must take account of problem areas which may be linked to the need for slow turning of an engine whilst selected for standby and prior to an actual start. (16)

Q2. (a) Describe, with the aid of a sketch, an open loop system for reducing SOx emissions from engine exhaust gas, explaining how the system operates whilst the vessel is in open waters. (6)

(b) Describe, with the aid of a sketch, a closed loop scrubber system for removing SOx from engine exhaust gas, explaining the operation of this unit and stating when it would be used. (10)

Q7. (a) Explain why charge air coolers are fitted to turbocharged diesel engines, stating the possible effects on engine operation and performance if they are not maintained in good condition. (6)

(b) As Chief Engineer Officer, write instructions for the routine in-service checking of charge air cooler performance and cleanliness together with the checking of condensate draining. (6)

(c) State, with reasons, the possible consequences if condensate is not drained from the charge air cooler. (4)

Q6. a. Describe, with the aid of a sketch a diesel engine fuel system which employs direct injection of liquid gas into the cylinders. (12)

b. Explain the advantages of this type of gas injection system compared with the use of gaseous fuel in the form of gas. (4)

Q5. (a) Describe, with the aid of a sketch, a waste heat recovery system for electrical generation using main engine exhaust gas in combined gas/steam turbine systems. (8)

(b) Describe the operation of the waste heat recovery system described in part (a) whilst the associated main engine is running. (8)

Q6. (a) Explain fatigue cracking, stating its causes and propagation. (8)

(b) Explain how the risk of fatigue cracking of cylinder head holding studs is liable to be increased by poor maintenance and engine overload. (8)

Q7. Write a report to the engineering superintendent regarding the replacement at sea of a damaged main engine cylinder cover. The report must explain how the problem was detected, the likely cause of the damage and the action which has been instituted to prevent further incidents of this type. (16)

Q8. a. State, with reasons, SIX points that should be covered by a risk assessment for the inspection of a main engine crosshead bearing. (6)

b. State how it can be ensured that the lifting equipment used for the inspection of a crosshead bearing is fit for the purpose intended. (4)

c. list THREE defects which might be detected during inspection of a crosshead pin and bearing, stating the probable cause of such defects. (6)

Q9. (a) Explain how a diesel generator is prepared and selected as a standby generator. (8)

(b) Write a procedure for checking a diesel generator engine after it has been shut down and before it is returned to standby duty. (8)