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)
Q5. Write a report for the engineering superintendent regarding the replacement of the fuel injectors of three main engine units due to severe erosion of the nozzle holes and burning of the injector tips. The report must explain how the defects were detected, the likely cause of the damage and the action which has been instituted to prevent further incidents of this type. (16)
Q2. (a) Sketch a main engine fuel system from the HFO and Low Sulphur service tanks to the main engine, showing all important valves. (6)
(b) Using the sketch drawn in part (a), write instructions for the changeover of a main engine fuel system from HFO to Low Sulphur fuel, indicating the timescale for each operation. (10)
Q2. A. Describe, with the aid of a sketch, the lubrication systems of a crosshead type diesel engine. (8)
B. Explain the properties required by the lubricating oil in each of the systems described in part (a), stating how these properties compare with those of a lubricating oil used in the crankcase of a trunk piston type diesel engine
Q5. With reference to electronically controlled engines:
A. Describe how fuel injection quantity and timing is adjusted. (6)
B. Describe how the exhaust valve timing may be varied. (5)
C. Describe how starting air valves are regulated. (5)
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)
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