Download JNTUA M.Tech 1st Sem 2017 Feb 9D15106a Tribology Question Paper

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Code: 9D15106a

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M.Tech I Semester Regular & Supplementary Examinations January/February 2017

TRIBOLOGY

(Machine Design)

Time: 3 hours

Max. Marks: 60

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Answer any FIVE questions

All questions carry equal marks

1. (a) Explain the skewness and kurtosis with schematic sketches.
   (b) What is a wear map? Explain it with a schematic representation.
2. A single row deep groove ball bearing has a dynamic load capacity of 40500 N and operates on the following work cycle:
   

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   (a) Radial load of 5000 N at 500 rpm for 25% of the time.
   (b) Radial load of 10000 N at 700 rpm for 50% of the time.
   (c) Radial load of 7000 N at 400 rpm for the remaining 25% of the time.
   Calculate the life of the bearing in hours.
3. Derive the generalized Reynolds equation for one dimensional fluid flow.

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4. What is a hydrostatic bearing? Derive pressure distribution for flat circular hydrostatic pad bearing in terms of lubricant flow, bearing geometry and lubricant viscosity.
5. (a) What are dry rubbing bearings? Explain the characteristics of impregnated bearings.
   (b) What are the divisions of conformal fluid film bearings?
6. (a) Discuss different types of temperature-viscosity equation.
   (b) What do you understand by viscosity index?

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7. (a) What is the principle of sealing? Explain it with simple schematic sketches.
   (b) What are mechanical seals?
8. Explain the condition based maintenance (CBM) procedure and its advantages.

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