Q3. (a) Describe means of recognizing deterioration of the lubricating oil (8)
(b) Describe how lubrication oil is conveyed to top end, bottom end and main bearings in large bore, 2-stroke cross head type slow speed diesel engine, you are familiar with (8)
Q7. A. State, with reasons, THREE properties required of crankcase oil which is to be used for a trunk piston main engine.
B. Explain how a representative sample of crankcase oil would be obtained from a trunk piston engine. C. Briefly describe the action to be taken if the crankcase oil charge cannot immediately be replaced and analysis shows – (i) Water is present; (ii) Alkalinity has fallen; (iii) Viscosity has changed appreciably; (iv) Carbon content has increased.
Q3. The analysis of oil may be used as a method of monitoring the condition of the equipment that it lubricates A. Explain briefly how shore analysts might test the oil; B. State the type of information that would be expected; C. Give possible reasons for an excess of: - i. Iron, ii. Copper, iii. Antimony Iv. Tin, v. Silica
Q6. Give a reasoned opinion as to the accuracy of the following assertions:
a) Absence of oil grooves in the liner wall between the oil supply points results in increased wear of liner and rings.
b) ‘Timed lubrication’ has little merit,
c) The most suitable position of the oil supply point is immediately below the bottom piston ring with the piston at top dead centre.
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