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Material Science And Engineering
Time : Three hours
Maximum marks : 100
Answer five questions, taking any two
from Group A, any two from Group B and
all from Group C.
All parts of a question (a, b, etc) should be answered atone place,
Answer should be brief and to-the-point and be supplemented with neat sketches. Unnecessary long
answers may result in loss of marks.
Any missing data ,or wrong data may be assume
d suitably giving proper justification.
Figures on the right-hand side margin indicate full marks.
Group A
1. (a) Mention the types of Bravais
lattices possible in crystalline materials. Show
that the atomic
packing factor for BCC crystal
structure is 0.68.
7
(b) State Fick’s laws of
diffusion.
7
(c) Difference between Frenkel and Schottky defects.
6
2. (a) Explain Hume Rothery rules that govern the
formation of substitutional solid solutions.
6
(b) State Gibb’s phase rule. Mention the number
of variables and the degree of freedom at the
eutectic temperature of a binary phase
diagram.
6
(c) Distinguish between the direction of the dislo
cation line, the Berger’s v
ector and the direction
of motion for both edge and screw dislocations, differentiating between positive and negative
types.
8
3. (a) Discuss the role of (i) grai
n boundaries and (ii) pr
ecipitate in strengthening metallic alloys
w.r.t yielding.
6
(b) Explain the significance of secondary stag
e of a creep curve, what
will be the effect of
increasing temperature and stress on the creep rate?
6
(c) Mention the essential diffe
rence between shear fracture and cleavage fracture
4
(d) Establish a relationship between engineer
ing strain and true strain. 4
4. (a) Differentiate between: 5x3
(i) Slip and twinning
(ii) Two types of mechanical working process
(iii) Recovery and recrystallization.
(b) Explain the Schmid’s law
5
Group B
5. (a) What is tempering? Differentiate betw
een austempering and martempering process.
6
(b) Explain in brief the following surface hardening treatments:
6
(i) Carburising
(ii) Nitriding
(c) Mention the basic requirements for an alloy
to behave as age-hardenab
le. Discuss the stages
of age-hardening process.
8
6. (a) Explain the fabrication of a glass-
ceramics. State the most important desi
rable characteristics
of glass-ceramics.
6
(b) What is devitrification? State the merits
and demerits of devitrification process.
5
(c) Briefly explain the types of refract
ories with suitable examples.
5
(d) “Residual thermal stresses may be introduced
into a structure by rapi
d heating or cooling”.
Explain the statement.
4
7. (a) State the difference between chain reactio
n and step reaction polymerization.
6
(b) Mention the advantages of polymer matrices
over metal matrices for composite materials. 6
(c) What is the distinct
ion between continuous phase and di
spersed phases in a composite
material? State the difference between particle reinforced and fibre reinforced composites.

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