Download Visvesvaraya Technological University (VTU) BE ( Bachelor of Engineering) ME (Mechanical Engineering) 2018 Scheme 2020 January Previous Question Paper 3rd Sem 18ME34 Material Science
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Third Semester B.E. Degree Examination, Dec 2019 .2020
Material Science
Time: 3 hrs.
Max. Marks: 100
Note: Answer any FIVE MI questions, choosing ONE full question from each module.
Module-1
I a_ Define APF. Calculate the APF for BCC Unit cell. (07 Marks)
b. Explain edge dislocation and screw dislocation. (08 Marks)
c. State and explain Fick's law:of diffusion. (05 Marks)
OR
.
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. ,D
1)
2 a. Define Stiffness , Yield strength , Toughness and Ultimate tensile strength. (08 Marks)
b. Explain Plastic dethrmation by Slip and twinning. (06 Marks)
c_ Explain strain hardening and solid state hardening process of strengthening of metals.
cr
,
(06 Marks)
cc
.
c +
? rq
P.
P -
i
Module-2
V
'.? E 3 a. Draw and explain the S ? N curve.
. .., -
(04 Marks)
b. Derive . and expression for stress relaxation.
0
(04 Marks)
c
.) u
,
c. Draw the Iron carbon diagram indicating the phase temperatures_ Explain the different
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phases in Iron carbon diagram. (12 Marks)
u 1)
Tes t
.
OR
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4 a. State and explain Hume Rothery Rules. (06 Marks)
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b. Explain the effect of any 4 alloying elements in steel. (06 Marks)
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c. Two metals A & B are alloyed in the proportion of 60% A and 40% B. The melting
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temperature of A & B are 650
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C and 450
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C. When they are alloyed together they do not
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form any compound or intermediate phase, but form. an Eutetic of composition 40% A and
..
0.. , 60% B which solidifies at 300
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C . The maximum and minimum solid solubilities of B in A
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and A in:,B
.
are 10% at 300
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C and remains constant till 0
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C. Assume solidus . liquidus and
,..-.,
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2 solves lines to be straight.
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co: 47.
i) Draw the equilibrium diagram and label all the
.
fields.
.- ._
;_. i.,
ii) The temperature at which solidification start and complete_
iii) Percentage of Eutectic at room temperature. (08 Marks)
t1)
.r. OR
- M
II =
Module-3
-
a 2
9
)
5 a. Define Heat treatment and give its classification. (06 Marks)
b. Explain how a TTT diagram is drawn. (08 Marks)
?: f-4
c. Explain Austempering and.Martempering. (06 Marks)
1.)
z
OR
6 a. Draw the TTT diagram for Eutectoid steel and explain it. (07 Marks)
O b. With neat sketch, explain induction hardening process. (05 Marks)
Q.?
c. Explain the composition , properties and uses of Gray Cast Iron, White Cast Iron and SG
Iron and Malleable Iron. (08 Marks)
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18ME34
?
-
x
r;
e r. ?
?
" ! . L
)
Third Semester B.E. Degree Examination, Dec 2019 .2020
Material Science
Time: 3 hrs.
Max. Marks: 100
Note: Answer any FIVE MI questions, choosing ONE full question from each module.
Module-1
I a_ Define APF. Calculate the APF for BCC Unit cell. (07 Marks)
b. Explain edge dislocation and screw dislocation. (08 Marks)
c. State and explain Fick's law:of diffusion. (05 Marks)
OR
.
?
. ,D
1)
2 a. Define Stiffness , Yield strength , Toughness and Ultimate tensile strength. (08 Marks)
b. Explain Plastic dethrmation by Slip and twinning. (06 Marks)
c_ Explain strain hardening and solid state hardening process of strengthening of metals.
cr
,
(06 Marks)
cc
.
c +
? rq
P.
P -
i
Module-2
V
'.? E 3 a. Draw and explain the S ? N curve.
. .., -
(04 Marks)
b. Derive . and expression for stress relaxation.
0
(04 Marks)
c
.) u
,
c. Draw the Iron carbon diagram indicating the phase temperatures_ Explain the different
?
=
-
-
phases in Iron carbon diagram. (12 Marks)
u 1)
Tes t
.
OR
. ?
O "0
4 a. State and explain Hume Rothery Rules. (06 Marks)
? =6
b. Explain the effect of any 4 alloying elements in steel. (06 Marks)
,?; ,7J'
vi ,-,-,
c. Two metals A & B are alloyed in the proportion of 60% A and 40% B. The melting
,., i
- .
7,.
?, ,
temperature of A & B are 650
?
C and 450
?
C. When they are alloyed together they do not
?
form any compound or intermediate phase, but form. an Eutetic of composition 40% A and
..
0.. , 60% B which solidifies at 300
?
C . The maximum and minimum solid solubilities of B in A
? ,,
? Et
and A in:,B
.
are 10% at 300
?
C and remains constant till 0
?
C. Assume solidus . liquidus and
,..-.,
?
E'
9) tt'
-
?
2 solves lines to be straight.
? ,-)
co: 47.
i) Draw the equilibrium diagram and label all the
.
fields.
.- ._
;_. i.,
ii) The temperature at which solidification start and complete_
iii) Percentage of Eutectic at room temperature. (08 Marks)
t1)
.r. OR
- M
II =
Module-3
-
a 2
9
)
5 a. Define Heat treatment and give its classification. (06 Marks)
b. Explain how a TTT diagram is drawn. (08 Marks)
?: f-4
c. Explain Austempering and.Martempering. (06 Marks)
1.)
z
OR
6 a. Draw the TTT diagram for Eutectoid steel and explain it. (07 Marks)
O b. With neat sketch, explain induction hardening process. (05 Marks)
Q.?
c. Explain the composition , properties and uses of Gray Cast Iron, White Cast Iron and SG
Iron and Malleable Iron. (08 Marks)
18ME3?
Module-4
7 a. Define Composite. Give its classification. (06 Marks)
b. Explain metal matrix composites and ceramic matrix composites. (06 Marks)
c. List the advantages, disadvantages and applications of composite materials. (08 Marks)
OR
8 a. Derive an expression for Young's modulus for ISO stress and ISO strain condition.
(12 Marks)
b. With neat sketch, explain Pultrusion..process. (08 Marks)
Module-5
9 a. Define Ceramic. Explain the types of ceramics. (05 Marks)
b. Differentiate between Thermoplastic and Thermosetting plastics. (05 Marks)
c. With neat sketch, explain Processing of plastic by Injection Moulding method. (10 Marks)
OR
10 a. Explain the different Non - destructive testing methods used for accessing residual life.
(10 Marks)
b. Define Smart Material. Explain the types of smart materials. (10 Marks)
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This post was last modified on 02 March 2020