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  3. question 6 a define the term lubricant and explain its...

Question: question 6 a define the term lubricant and explain its...

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Question 6 (a) Define the term lubricant and explain its importance in tribology. Define the term additive. Why are additives used in lubricants? List various fami- lies of additives. [8 marks] (b) Explain the various lubrication regimes and how the regimes can be de- termined based on the lubricant film thickness and the roughness of the contacting surfaces. [10 marks] (c) A steel surface with conical asperities of an average semi-angle of 60° slides against a soft aluminium surface of hardness, H - 100 MPa un- der a constant normal load of 20N. Calculate the volume of aluminium displaced in unit sliding distance.

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