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Q5. Express your reactions and state the subsequent investigation you would make if a laboratory report on a used diesel engine oil sample indicated the presence of appreciable amounts of: -

A. Iron; B. Copper, Antimony and Tin; C. Silicon.

Q7. With reference to health hazards from asbestos:  a. state where asbestos may be found on board ship; b. state the health risks from asbestos;

c. outline the precautions necessary to minimize exposure to asbestos during an emergency repair.

Q1. Describe the procedure for replacing a Main Engine cylinder liner and explain using sketches where necessary, those parts, which require close attention during lifting of cylinder liner. Also describe the procedure for pressure testing the cooling water side of the Main Engine Cylinder head.

Q9. a) State the reason for fitting crosshead guides to engines and explain why ‘ahead’ and ‘astern’ faces are required with uni-directional engines.

b) Describe how crosshead guide clearance is checked and adjusted.

c) List reasons for limiting such crosshead clearance.

Q8. If soon after joining a motor ship, you found a number of holding down bolts slack and fretting to have occurred in the area of slack bolts describe how you would handle the situation?

Q2. a) During an inspection it is noticed that tie rods of certain main engine units have become slack, state with reasons the possible causes of this.

b) Explain how correct tension is restored and the risk of future slackness minimized.

c) A tie rod has fractured and cannot be replaced immediately, State with reasons the course of action to be adopted in order to allow the engine to be operated without further damage.

Q5. With reference to fixed CO2 system for fighting machinery space fires:

a) sketch a CO2 bottled system.

b) How the number of CO2 bottles required for ship is calculated?

c) explain how the system sketched in part (a) is protected from overpressure

d) Describe the periodic maintenance required.

Q4. a) State what is meant by machinery condition monitoring

b) Describe how typical shipboard condition monitoring is carried out

c) State how the information obtained by monitoring may be used to indicate Machinery condition trends.

Q9. a) Describe TWO methods of tracing a superficial crack in a marine machinery component. (8)

b) Explain how propagation of a crack in a machinery component can be arrested. (8)