Download PTU B.Tech 2020 March ME 7th and 8th Sem Industrial Tribology Question Paper

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ME (Mechanical Engineering) 2020 March 7th and 8th Sem Industrial Tribology Previous Question Paper

1 | M - 7 2 0 2 2 ( S 2 ) - 9 4 5
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ME) (2012 Onwards E-II) (Sem.?7)
INDUSTRIAL TRIBOLOGY
Subject Code : DE/ME-3.6
M.Code : 72022
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
1. Answer briefly :
a) Define Wear.
b) Describe various types of lubricants.
c) Illustrate hydrostatic lubrication.
d) Briefly describe Archard?s equation.
e) List any two methods of testing lubricants.
f) Differentiate between rubbing and sliding motion.
g) Describe Sommerfield number.
h) List any two methods of studying surfaces.
i) List out the additives used in lubricants.
j) Why surface-coatings are necessary in Industrial applications?

FirstRanker.com - FirstRanker's Choice
1 | M - 7 2 0 2 2 ( S 2 ) - 9 4 5
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(ME) (2012 Onwards E-II) (Sem.?7)
INDUSTRIAL TRIBOLOGY
Subject Code : DE/ME-3.6
M.Code : 72022
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
1. Answer briefly :
a) Define Wear.
b) Describe various types of lubricants.
c) Illustrate hydrostatic lubrication.
d) Briefly describe Archard?s equation.
e) List any two methods of testing lubricants.
f) Differentiate between rubbing and sliding motion.
g) Describe Sommerfield number.
h) List any two methods of studying surfaces.
i) List out the additives used in lubricants.
j) Why surface-coatings are necessary in Industrial applications?

2 | M - 7 2 0 2 2 ( S 2 ) - 9 4 5
SECTION-B
2. Describe the following terms :
a) Surface roughness
b) Waviness
c) Form errors
3. Discuss the laws of rolling friction. Suggest some laws of siding friction analogous to
those of rolling friction.
4. Explain any two methods of testing the lubricants.
5. a) Can hybrid hydrostatic and hydrodynamic bearings be developed and used to
advantage?
b) Give examples of operating conditions under which the application of hydrostatic
bearings would be necessary or highly desirable.
6. Describe various properties of liquid and grease lubricants.

SECTION-C
7. A hydrostatic thrust bearing of a turbine generator is designed for a load of 24 KN. The
outside diameter is 0.2 m and diameter of recess is 0.1 m. The film thickness is to be
0.1 mm.
a) Determine the recess pressure and volume flow required if the oil used is of 0.1 cP.
b) Assuming P
r
/P
s
= 0.5, determine the stiffness of bearing. Generator speed = 750 rpm.
Here P
r
is the recess pressure and P
s
is supply pressure.
8. a) What are the two conditions for the occurrence of hydrodynamic lubrication?
b) Describe the term elasto hydrodynamic films and their effects.
c) Describe the categories of boundary and extreme pressure lubrication.
9. Describe and Sketch various friction and wear measurement methods.


NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.

FirstRanker.com - FirstRanker's Choice