Q9. (i) Discuss 'on board testing' of lubricating oil. What are the salient points for which lube oil testing is necessary? (4)
(ii) Name the test which are normally carried out and reasons for same. (4)
(iii) Name instruments used for measuring ‘viscosity' and 'flash point' Explain their, working principle (8)
Q4. With reference to lubricating oil:
(a) Explain why oil employed in the crankcase of a trunk piston engine differs in its properties from that employed in the crankcase of a crosshead engine. (6)
(b) List FOUR effects of bacterial attack on crankcase oil.
(c) Explain the action which must be taken if bacterial attack of the crankcase oil is detected. (4)
Q2. (a) Describe with suitable sketches, how lubricating oil is conveyed to top end, bottom end and main bearings in a large bore slow speed engine. (10)
(b) List the causes leading to sudden loss of lubricating oil pressure in the engine. (6)
Q8. a) Draw Lubricating oil piping diagram will all fittings for a trunk type 4- stroke Diesel Engine. (8)
b) What properties are required for a Lubricating oil used in a 4-stroke Diesel Engine? (4)
c) What is the effect on lubricating oil due to various contaminants during operation of engine? (4)
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