Q3. With reference to the main engine burning heavy fuel. Ship has been asked to use low Sulphur diesel oil, what are the problems likely to be encountered and risks involved in continuous running of main engine on such low Sulphur fuels.
Q5. With respect to Air Starting systems for 2 stroke diesel engines:
A. Sketch a Main Engine starting air starting system and describe how it operates.
B. List the safety devices and interlocks incorporated in main engine air starting system and state the purpose of each.
Q1. Sketch and show all parts of a two-stroke engine stuffing box. Describe the procedure of overhauling two stroke engine stuffing box, without removing piston. Answer should include all safety precautions and necessary tools used for stuffing box overhaul.
Q4. With respect to piston cooling in large two stroke marine engines;
A. Briefly discuss the relative advantages and disadvantages of oil and water for piston cooling.
B. Sketch a piston for a large two-stroke crosshead engines indicating the coolant flow.
C. State the causes of piston cracking and burning and how it can be avoided.
Q7. With respect to large two stroke crosshead main engines;
A. Sketch and describe a crosshead designed to prevent or minimize bearing edge loading.
B. State how the arrangement describe a achieves its purpose.
C. What would be an acceptable range of bearing clearance for the top end bearing and bottom end bearings of a large two-stroke marine diesel engine.
Q5. State the probable engine defects and rectifying action needed if the following conditions are indicated on a single unit of a large two-stroke marine diesel engine giving seven units. State any additional information which might be of help in forming on option.
A. Increased exhaust temperatures. B. Reduced exhaust temperature.
C. Reduction in jacket cooling water return temperature.
D. Increase in jacket cooling water return temperature.
Q6. With reference to bridge control of a large slow speed propulsion engine.
A. How is starting and reversing achieved?
B. Investigate and suggest remedial action required if the engine,
(i) Fails to turn on air.
(ii) Turns on air but fails to fire on fuel;
(iii) Fails to reverse.
Q5. With respect to scavenge fires in Large two stroke Marine engines:
A. State the common causes of scavenge fires.
B. List the indication that a scavenge fire is in progress.
C. State the immediate action to be taken in the event of a scavenge fire.
D. List with reasons the checks and precautions necessary before an engine is put back in to service following a scavenge fire.
Q3. With reference to turbocharger bearings:
A. Discuss the relative advantages and disadvantages of white metal sleeve and ball race bearings for turbocharger rotor support.
B. State with reasons how axial location of the rotor is achieved.
C. Explain how the bearing are kept cool in service.
D. Indicate how the bearings are sealed from the atmosphere and exhaust gas.
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