Q1. A. Briefly describe any one of the manufacturing process involved in semi built or welded construction of crankshaft of large marine engine; B. Give a composition of material used; C. Draw a stress diagram for stress in web of a crankshaft.
Q2: With reference to a large diesel engine piston: A. What stresses act on a piston during operation? B. What are the causes of burning and cracking of piston crown. C. How positive circulation and cracking of piston crown; D. Why piston crown may be given a slight taper?
Q3: What are the design aspect of the following component to improve injection atomization and penetration of fuel in marine diesel engine. A. Injector nozzle. B. Piston crown. C. Cylinder head.
Q4. As compared to other bearing in a large marine diesel engine give reason why top end bearing are more prone to failure. Have greater clearance in proportion to pin diameter. Have larger diameter in proportion to length.
Q5. A. Identify the principal factors responsible for fouling of the gas side of turbo chargers? B. What are the effects of running engines with fouled turbo chargers & how are these identified?
Q6. Write short note on- A. Air starting line explosion; B. Scavenge Fire
Q7. A. Describe briefly the defects of main bearing and their causes; B. Give typical composition of bearing metal and importance of each component
Q8. A. Sketch the profiles of ahead and astern cams for a main engine fuel injector; B. Show, using a simple sketch, how the cams are mounted on the shaft?
Q9. A. Describe, with the aid of a sketch, a two-stage air compressor. B. Explain why compression is carried out in stages and inter cooler is required between stages.
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