APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

FIRST SEMESTER M.TECH DEGREE EXAMINATION, DECEMBER 2015

Mechanical Engineering
(Machine Design)
01ME6107 Industrial Tribology

Max. Marks:60 Duration: 3 Hours

(Answer any two questions from Part A, Part B and Part C)

Part A (Modules | and II)

1. (a) Explain the principle of working of a Taylor HobsenTalysurf.
(b) Explain the different methods of quantifying surface roughness.
2. (a) Explain the origin of Micromanotribology.
(b) Describe with figure the Atomic force microscope.
3. Discuss the various friction theories and write the merits and demerits.

(2 9 18 Marks)

Part 8 (Modules and IV)

4. Write in briefthe various types of wear encountered in engineering surfaces under
relative motion.

S. Derive Hagen Poiseuille equation applied to flow through a capillary tube.

6. Derive Reynolds equation from basic principles and describe the physical meaning of
each tern.

(2x 9 = 18 Marks)
Part © (Modules ۷ and VI)

7. ^ ೦17೦137 hydrostatic pad has a constant flow rate Q. The circular pad is supporting a
load of W — 50001. The outside disk diameter is 200 mm and the diameter of the
circular recess is 100 mm. The oil viscosity is = 0.005 115/1772. The pad is operating with
a clearance of 120 gm.

a.
b.

Find the recess pressure, Pr.

Calculate the constant flow rate of the oil through the bearing to maintain the
clearance.

. Find the effective area of this pad.
. Find the stiffness ofthe circular pad operating under the condition in this problem.