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2003 Course Tribology

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Total No. of Questions : 12] P1186 [Total No. of Pages : 5 [3664]-145 B.E. (Mechanical S/W) TRIBOLOGY (2003 Course) (402063) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic tables, slide rule and electronic pocket calculator is allowed. Assume suitable data, if necessary. SECTION - I Unit - I Q1) a) Explain tribological problems in industry. b) State desirable properties of lubricant. c) Explain API classification of lubricating oil. [8] [6] [2] OR Q2) a) Write a short note on Viscosity Index. [5] b) Compare Rolling contact bearings with Hydrodynamic bearings based on following points : [8] i) Starting Friction, ii) Load Carrying Capacity, iii) Speed and iv) Life. c) Determine the viscosity of the lubricant in centipoises having viscosity 160SUS and specific gravity 0.86. [3] Unit - II Q3) a) Using deformation theory prove that coefficient of friction due to deformation is directly proportional to semi-cone angle for conical asperity. [6] b) Explain Fretting and Percussion wear in detail. [6] c) Enumerate the factors affecting wear. [4] P.T.O.

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