Download JNTUA B.Tech 1-2 R15 2019 June 15A03201 Material Science And Engineering Question Paper

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Code: 15A03201


B.Tech I Year II Semester (R15) Regular & Supplementary Examinations May/June 2019
MATERIAL SCIENCE & ENGINEERING
(Mechanical Engineering)

Time: 3 hours Max. Marks: 70

PART ? A
(Compulsory Question)

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1 Answer the following: (10 X 02 = 20 Marks)
(a) Why is the grain boundary irregular?
(b) What is an alloy? Write examples.
(c) List the independent variables which are to be controlled in the state of a system in equilibrium.
(d) What parameters will you consider to construct the equilibrium diagram?
(e) How do you vary the properties of gray cast iron?
(f) List the most important properties of copper.
(g) Define Annealing.
(h) If the primary consideration is hardenability, which alloy steel should be selected?
(i) What are ceramics? Write examples.
(j) What are composite materials?

PART ? B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT ? I

2 How does the metallic bond differ from the ionic and covalent bonds? Explain.
OR
3 Sketch and explain the schematic representation of substitutional and interstitial solid solutions.

UNIT ? II

4 List and explain the methods used to construct the equilibrium diagrams.
OR
5 Sketch and explain the phase diagram of two metals completely soluble in the liquid and solid
states.

UNIT ? III

6 Sketch and explain the microstructure and properties of malleable cast iron.
OR
7 How do you designate the aluminum alloys? Explain in brief.

UNIT ? IV

8 Sketch and explain the hardening effect of various elements as dissolved in alpha iron.
OR
9 What is hardening? Explain the method of flame hardening in brief.

UNIT ? V

10 Explain the influence of fiber length on strength of the composites.
OR
11 List and explain the polymer matrix composites in brief.

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R15
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