This download link is referred from the post: JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)
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Code: 9D15106a
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M.Tech I Semester Supplementary Examinations February/March 2018
TRIBOLOGY
(Machine Design)
(For students admitted in 2012, 2013, 2014, 2015 & 2016 only)
Time: 3 hours
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Max. Marks: 60
Answer any FIVE questions
All questions carry equal marks
- Write explanatory notes on:
- Wear of ceramic materials.
- Wear measurements.
- Advanced material's use in tribology application.
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- What properties are expected of bearing materials? List them.
- What is cubic mean load? Explain in detail the procedure involved in preloading of bearings.
- Write a detailed note on condition monitoring using shock pulse method.
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- Briefly describe the mechanism of pressure build-up in a hydrodynamic bearing with relevant figures.
- Derive the Reynold's equation for 3D hydrodynamic lubrication. Also state the assumptions made in this derivation.
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- Explain the working principle of hydrostatic thrust bearing with figures.
- A hydrostatic circular thrust bearing has the following data:
Shaft diameter = 300 mm, Diameter of pocket = 200 mm, Shaft speed = 100 rpm,
Pressure at the pocket = 500 kN/m², Film = 0.07 mm,
Viscosity of lubricant = 0.05 PaS.
Determine: (i) Load carrying capacity. (ii) Oil flow rate. (iii) Power loss due to friction.
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- Derive the equations for static load bearing capacity of a rolling element bearing. A ball bearing is operating on work cycle of 3 hours consisting of:
- A radial load of 3 kN at 1440 r.p.m for one quarter cycle.
- A radial load of 5 kN at 720 r.p.m for half cycle.
- A radial load of 2.5 kN at 1440 r.p.m for the remaining cycle.
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- What is the role of additive lubrication? What are the additives used in lubricating oils?
- How rolling bearings are lubricated with grease? Discuss the factors on which the relubrication interval of a roller bearing depends.
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- Discuss the procedure involved in the selection of mechanical seals.
- What are the applications of throttling bushes?
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- Explain the following:
- Failure analysis of plain bearings.
- Wear analysis using ferrography.
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This download link is referred from the post: JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)
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