Q1. Many modern turbochargers use sleeve type bearings for rotor support. Explain the reasons for their preference over the rolling contact bearings; With a sketch describe the lubricating system provided for this type; In a turbocharger with integral type of bearings, describe the procedure for renewing the bearings.
Q4. Main engine fuel injection systems require a lot of attention to ensure optimum performance. As the Chief engineer of a 15 year old vessel which has recently been bought by your company you have found that the main engine fuel system had been poorly maintained. Explain the steps you will take to ensure good standards are brought back. Your answer should be comprehensive, starting from ordering of bunkers.
Q3. With reference to U.M.S. operation: State with reasons the essential requirements for unattended machinery spaces; As Chief Engineer, describe how you would respond to the irretrievable failure of the machinery space fire alarm system whilst the ship is on voyage.
Q4. With reference to Main engine piston rings:
(a) Analyze the causes of piston ring breakage.
(b) How maintenance and engine operation can minimize piston ring breakage.
(c) Explain the possible consequences with respect to performance and safety of operating the engine with broken or severely worn piston rings
Q8. With reference to main boiler super heater arrangements:
(a) Compare the advantages and disadvantages of contra flow with parallel flow design.
(b) How the element tube bank is supported and yet allow for expansion?
(c) How boiler carryover affects super heater effectiveness?
Q4. It is noted in engines burning heavy fuel that the top of the piston crown may waste and gradually burn away. What is done to rectify this condition?
Q7. A. Explain how static and dynamic imbalance of crankshafts can be overcome. B. Discuss the methods employed to obtain primary, reciprocating balance in an engine and plain why they are not completely successful. C. Describe engine additions which may be fitted to overcome problems resulting from primary or secondary imbalance.
Q8. A. State, with reasons FOUR possible causes of an engine failing to turn over engine control is moved to the start position. B. Explain how the cause of an engine failing to turn over on air may be traced. C. Explain how local manual is achieved in the event of failure of the remote-control system fitted to a marine diesel engine. D. State the procedure involved in achieving manual reversal of a marine diesel engine.
Q6. Discuss the importance of correct cylinder lubrication in a large diesel engine, explaining the possible consequences of both over and under lubrication. Describe the qualities required in a cylinder lubricant for use in an engine burning high viscosity (heavy) fuel oil. Comment on the timing of the injection of the lubricant in relation to the working cycle of the engine. Changes, if any, in the quality of the cylinder lubricating oil used for a large arrange diesel engine, with the imposition of Annex IV of MARPOL
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