No. of Pages:2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER M. TECH DEGREE EXAMINATION, DECEMBER 2017
Mechanical Engineering

(Machine Design)
01ME6107 INDUSTRIAL TRIBOLOGY

Answer any rwofull questions from each part
Limit answers to the required points.

Use of Design Data Hand Book is permitted

Max. Marks: 60 Duration: 3 hours
PARTA
1. a. Howthe surface roughness affects the tribological properties of surfaces? (5

marks) b. Explain the various regimes Of fluid friction. (4 marks)

2. 2. Briefly explain the Bowden and Tabor hypthoesis. (5 marks)

b. Sack slip behavior in friction. (4 marks)
3. 3. Compare the operating parameters of SFA, STM and AFM/FFM. (5 marks)

0. With the help of a neat sketch, explain the working of Surface Force
Apparatus. (4 marks)

PART 8

4. ട്ട. Differentiate between adhesive and abrasive wear. (5 marks)

0. Explain the term viscosity index and viscosity index improvers. (4 marks)

5. ഒ. Describe the phenomenon of 'Pitting'. (3 marks)

b. With the help of a neat sketch, explain the working of a viscometer. (6
marks)
6. ഒ. Show that the pressure at a point (distance r from the centre) in the
incompressible fluid of viscosity g between two parallel circular plates (radius R and
film thickness h) that approach each other with a velocity V is given by p=3uV (R2-r2)

and estimate the load carrying capacity.
113 (6 marks)

b. State the assumptions of Reynold's equation. (3 marks)