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.
Q8. What is a “Cam"? Explain its function. With reference to its application in diesel engines
Discuss the requirement and the type of cam used in
a) Fuel Pump
b) Indicator drive
c) Inlet Valve
d) Exhaust Valve
e) Starting air distributor. (16)
Q7. Analyse the problem of cylinder liner lubrication with reference to oil injection timing relative to piston position, speed and direction of motion. Describe the worst effects of inaccurate lubricant injection timing and how it can have a detrimental effect on developed power in the cylinder. Describe with sketches the arrangement for conveying the oil through the cylinder jacket. (16)
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)
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