Exam Details
| Subject | Tribology | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering (DMEVI)& B.Tech. MECHANICAL ENGINEERING 1-4 (BTMEVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2015 | |
| City, State | new delhi, |
Question Paper
Explain the laws of rolling friction. What are the similarities between rolling and sliding friction Distinguish between the two.
Differentiate between rubbing and sliding motion. Give practical examples of each.
Discuss briefly any seven desirable properties of a good bearing material. List few materials used in bearings.
Explain in detail the mechanism of lubrication. Mention various types of lubrication methods.
Briefly explain the Hydrodynamic theory of lubrication. State the basic assumptions made in this theory.
What are the additives used in lubricating oils Give their classification. What are their basic functions?
4. A lightly loaded full journal bearing has the following specifications:
Bearing diameter 80 mm
Bearing length 60 mm
Diametral clearance 0.12 mm
Journal speed 2000 r.p.m.
Viscosity of lubricating oil 4 cP
Radial load 1000 N
Determine the following
Frictional force
Torque
Power loss
Coefficient of friction
5. Explain the following
Scuffing
Pitting
Effect of temperature on wear
Effect of temperature and pressure on viscosity
How are rolling bearings lubricated by grease? Discuss the factors on which the time interval of lubrication of a roller bearing depends.
Discuss the different modes of bearing failure.
7. Explain any two of the following:
Abrasive Wear
Erosive Wear
Corrosive Wear
Adhesive Wear
Differentiate between rubbing and sliding motion. Give practical examples of each.
Discuss briefly any seven desirable properties of a good bearing material. List few materials used in bearings.
Explain in detail the mechanism of lubrication. Mention various types of lubrication methods.
Briefly explain the Hydrodynamic theory of lubrication. State the basic assumptions made in this theory.
What are the additives used in lubricating oils Give their classification. What are their basic functions?
4. A lightly loaded full journal bearing has the following specifications:
Bearing diameter 80 mm
Bearing length 60 mm
Diametral clearance 0.12 mm
Journal speed 2000 r.p.m.
Viscosity of lubricating oil 4 cP
Radial load 1000 N
Determine the following
Frictional force
Torque
Power loss
Coefficient of friction
5. Explain the following
Scuffing
Pitting
Effect of temperature on wear
Effect of temperature and pressure on viscosity
How are rolling bearings lubricated by grease? Discuss the factors on which the time interval of lubrication of a roller bearing depends.
Discuss the different modes of bearing failure.
7. Explain any two of the following:
Abrasive Wear
Erosive Wear
Corrosive Wear
Adhesive Wear
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
- National Centre for Disability Studies (NCDS)
- School of Agriculture (SOA)
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- School of Continuing Education (SOCE)
- School of Education (SOE)
- School of Engineering & Technology (SOET)
- School of Extension and Development Studies (SOEDS)
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Subjects
- Advanced Dynamics Of Machine
- Automobile Engineering
- Combustion Engineering
- Computer Aided Manufacturing
- Computing Aided Design
- Design of Machine Elements
- Engineering Metallurgy
- Engineering Thermodynamics
- Experimental Stress Analysis
- Finite Element Analysis
- Fluid Mechanics
- Heat And Mass Transfer
- Heat Transfer
- I.C. Engines
- Industrial Engineering
- Industrial Ergonomics
- Industrial Measurement And Quality Control
- Industrial Organization And Management
- Kinematics and Dynamics of Machines
- Machine Design - I
- Machine Design-Ii
- Machine Drawing
- Machines Tools
- Maintenance Engineering
- Material Science
- Materials Handling
- Mechanical System Design
- Mechanical Vibration
- Mechanics Of Materials
- Mechatronics
- Metrology
- Metrology And Quality Control
- Non-Conventional Energy Resources
- Non-Destructive Testing
- Nuclear Power Engineering
- Optimisation Techniques In Engineering
- Optimization For Engineering Design
- Power Plant Engineering
- Power Transmitting Elements
- Product Development And Design
- Production And Operations Management
- Production Technology - Ii
- Production Technology-I
- Refrigeration And Air Conditioning
- Refrigeration System
- Robotics
- Safety Engineering
- Technical Entrepreneurship
- Thermal Engineering
- Thermal Engineering - I
- Thermofluid Engineering
- Total Quality Management (Tqm)
- Tribology
- Turbo Machines
- Unconventional Manufacturing Processes
- Welding Engg.