Q1. As Chief Engineer Officer, write a report to the engineering superintendent regarding failure of a four-stroke main engine to complete a slow turning procedure and the discovery of water around a cylinder head gasket after the failed slow turning attempt. The report must outline possible causes of the problem and the steps taken to identify the exact cause. The report must also explain the measures taken to rectify the defect(s) and the steps taken to prevent similar future incidents. (16)
Q2. With reference to turbocharger systems;
a. Describe, with the aid of a sketch, a turbocharger jet assist system, explaining how it and why it is used. (10)
b. Describe with the aid of a sketch a waste gate and by pass system explaining why such an arrangement is fitted. (6)
Q3. With reference to a Closed Loop engine exhaust gas SOX scrubber system:
a. Describe, with the aid of a sketch, such a system; (8)
b. State, with reasons, the fluid which is used for SOX scrubbing in this system; (4)
c. State how the effectiveness of the scrubbing fluid is maintained and how the sludge is removed and disposed of. (4)
Q4. A. Describe, with the aid of a sketch, the lubrication systems for a crosshead engine, explaining the Properties required for the lubricating oil in each system;(10)
b. Describe a system which may be used to ensure that the cylinder lubricating oil properties are available for a crosshead engine when changing between fuels (including between fuel oil and gas), stating why it is not desirable to use the same cylinder LO for different fuel specifications (including gas); (6)
Q5. (a) Describe, with the aid of a sketch, the arrangement of the gas and liquid fuel systems at the cylinder of a dual fuel 4-stroke engine, stating the input and output signals at the controller. (12)
(b) Describe the arrangement of the gas fuel piping system used for a 4-stroke dual fuel engine, stating the safety features incorporated. (4)
Q6. A. Describe how crosshead bearing and guide clearances can be checked. (6)
b. Describe, with the aid of a sketch, the procedure for checking the condition of a crosshead engine bottom end bearing. (10)
Q7. Describe, with the aid of a sketch, an electronically controlled common rail fuel injection system for a marine diesel engine showing the pumps, common rail, control arrangements and injectors for one of the cylinders. (10)
B. State, with reasons, the advantages of an electronically controlled common rail fuel injection system. (6)
Q8. A. Describe, with the aid of a sketch, a main engine cooling water system, explaining why different parts of the system have different operating temperatures. (10)
B. Describe the charge air supply system for a turbocharged engine, explaining the purpose of each main part. (6)
Q9. Explain why multiple air inlet and exhaust valves are fitted to some medium speed diesel engines.(4)
Explain how the valve actuator (tappet) clearance is set for multiple valve installations. (4)
Write a procedure for checking the valve operating mechanisms of a medium speed engine. (8)
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