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Q7. Recent experience has shown persistence damage occurring on seating faces of main engine exhaust valve, which is not confined to any particular unit; (a) State with reason the possible causes; (b) State the short-term action to be taken in order to minimize engine operational problem; (c) State with reason how future incident of this nature could be minimized

Q9. (a) Describe how it is determined whether a crankshaft was twisted during a major “smash up” in a main engine.

(b) Explain where twisting is most likely to occur.

(c) Specify with reasons the degree of twisting that might be accommodated without correction

(d) Explain briefly what adjustments and precautions should be instituted when putting an engine with a twisted crankshaft back into service.

Q7.a) What are the structural parts of 2-stroke main Engine? (6)

b) How are different structural parts held together? (4)

c) What is the function of Cross Head Guides.

(4)

Q9. (a) Describe what would be the indications of crank case explosion in main engine. (4)

(b) Describe actions to be taken, if there is crank case explosion in main engine. (8)

(c) Describe means of prevention of crank case explosion. (4)

Q7. A. Difficulty has been experienced in maintaining engine speed at the set value. State the possible causes and how each of these causes may be detected. (8)

B. Describe the action to be taken in order to ensure safe operation of the main engine plant in the event of complete failure of the remote control and sensing equipment. (8)

Q7. (a) Sketch a section through the bedplate and A frame of a large slow speed engine, identifying parts, method of construction and materials (10)

(b) Explain the function of the tie bolts and how after an alignment problem, these would be tightened (6)

Q8. (a) (i) Describe with the aid of a sketch, a main engine exhaust valve which is hydraulically operated (8)

(ii) Explain the operation of this valve (4)

(b) State the materials used for the seat and valve described in (a) (4)

Q6. Write short notes on:

(a) Main air starting valves (4)

(b) Exhaust valve rotator (4)

(c) Scavenge relief valve (4)

(d) Function of Labyrinth Seals in turbocharger (4)