No. of Pages: 2

API ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FIRST SEMESIT'ER M.TECH DEGREE EXAMINATION, DECEMBER 2018
Mechanical Engineering (Machine Design)

01ME6107 INDUSTRIAL TRIBOLOGY

Answer any twoful! questions from each pan
Limit answers to the required points.
Use of Design Data Handbook is permitted
Max. Marks: 60 Duration: 3 hours
PART A

1. 2. Explain the terms physisorbed layer, chemisorbed later and deformed
(6 marks) layer in a solid surface.

b. Explain the significance micro/ nanotribology. (3 marks)
2. a. With the help of neat sketches, explain Friction force microscope (FFM). (6 marks)
b. Write a short note on microscale friction. (3 marks)
3. a. Briefly explain theory of adhesive friction. )5 marks)
b. Explain how friction varies in metals and ceramic materials. (4 marks)
PART 8
4. ೩, Explain the various stages of wear and the mechanisms of wear. (5 marks)
b. Discuss the importance of viscosity in lubricant selection. (4 marks)
5. a. Discuss the wear testing methods in Tribology. (4 marks)
b. Explain any two methods for measuring viscosity? (5 marks) *
6. a. Derive an expression for rate of flow between parallel plates of length "L". (7
marks)
b. State the assumptions of Reynolds's equation (2 marks)
PART C
7. a. Write a short note on classification of bearings. (4 marks)
b. With the help of a neat sketch explain the terms eccentricity, pressure
(5 marks)
distribution, attitude and attitude angle.
c. Discuss the role of restrictors in the design of hydrostatic bearings. (3 marks)