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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.

Q2. With reference to behaviour of fabricated bed plates and frames in services:

A. Identify various forces imposed simultaneously upon them;

B. Explain how engine structure withstands these forces;

C. State how these forces are transferred to ship’s structure

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.

Q4. While operating at Sea during rough weather conditions, fire sparks have been observed coming out from the chimney. On investigation, it has been observed that the fuel contains considerable quantity of water and sludge. As the Second engineer of the vessel. Explain:
A. Immediate actions taken to rectify the problem.
B. Precautions you take to avoid recurrence of this type of problem.

Q5. Explain the term “cascade control’ and sketch such a system suitable for use with a main engine jacket cooling water system. Show the variation of pressure and temperature at major points of the system.

Q6. With Respect to main engine turbocharger;

A. Explain why cleanliness throughout the turbochargers system is critical to engine performance?

B. Describe in-service cleaning procedure for gas and air sides of a turbocharger indicating safety precautions to be observed?

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.

Q9. A diesel generator when fitted in a machinery space which is periodically unmanned may be equipped with monitoring alarms of the exhaust temperatures. Discuss the relative merits of

A. Individual cylinder maximum temperature alarms;

B. Individual cylinder maximum and minimum temperature alarms;

C. Individual cylinder maximum temperature alarm and an alarm for any two cylinders exhaust temperatures deviating more than 35°C. Explain how arrangement can be provided for.