Download AKTU B-Tech 3rd Sem 2015-2016 NME 301 Material Science Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 3rd Semester (Third Semester) 2015-2016 NME 301 Material Science Question Paper

Printed Pages: 4 626 NME-301
(Following Paper ID and Roll No. to be filled in your
. Answer Book) '
Roll No.
B.Tech.
(SEM. III) THEORY EXAMINATION, 2015-16
MATERIALSCIENCE
[Time:3 hours] [MaximumMarksz 100]
Section-A
l. Attempt all parts. A11 pafts carry equal marks. Write
answer of each part in short. ' _ (2X10=20)
(a) What is the importance of the materials explain
brie?y.
(b) Why Yield points Occurs in low Carbon steel.
(7c) Classify different type of chemical bonds with
appropriate examples. '
I (d)? Write th?'name cf an atomic models and explain
any one on them.
(6) " Ei?'erentiate B?tWeen Edge dislocation and Screw, -
dislocation.
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(0 Why Etchant is used a?er polishing. Write etchant
name for Stainless steel.
(g) Explain smart materials & its application.
(h) What is duralumin? Giye the composition & their
applications.
(i) Explain the diffeenee between Addition
polymerization and Condensation polymerization.
(i) A hardened steel ball of 0.50 cm diameter is used
to indent a steel specimen in Brinell hardness test.
Diameter of indentation measured by an optical
microscqpe of magni?cation 10 X is observed to
be 32.5mm Calculate Brinell hardness number of
the steel specimen.
Section-B
Attempt any five; questions from this section. (lOXS=50)
2.
Compare the microstructure of M. S. CI, and which
material will be more corrosion resistance and why?
Explain in briefCreep test and what is its importance.
Why does the electrical conductivity of intrinsic sillicon
& germanium increases with increasing temp?era'ture?
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l8775 (2) NME-301
5. Write main difference between thermoplasticsand
themiosets with example.
6. What you understand by lever rule, Determine the mass
fraction of the phases present at 184? C in a sample of
lead & tin with 45% tin in it.
7. Discuss effects of alloying elements on the properties
of steel?
8. Explain Austempering and Martempering process with
suitable sketch.
9. What are some method by which processing of ceramic
materials in carried out? What are the applieaations of
ceramic materials?
Section-C
Attempt any two questions from this section. (15X2=30)
10. Draw i'ron-earbon equilibrium diagram, and show their
salient features. Indicate signi?cance of this diagram for
heat treatment of steel.
18775 (3) ETD.

11. What ?is super conductivity and super conducting
transition temperature? Explain what is Messier effect
shown by super-conduction material & what are its
possible uses? ?
12. Shown by graph Brittle & Ductile fracture of materials,
rExplain in brief Grif?th?s Theory of Brittle fracture.
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18775 (4) NME-?301