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

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Code: 15A03201


B.Tech I Year II Semester (R15) Supplementary Examinations December 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) What is grain size? List the factors that promote fine grain in a casting.
(b) What are electron compounds? Give examples.
(c) What information will you get from an equilibrium diagram?
(d) Draw the hypothetical equilibrium diagram for two metals insoluble in the liquid and solid states.
(e) Differentiate between the microstructure of gray cast iron and malleable cast iron.
(f) Why do aluminium alloy rivets have to be refrigerated until used?
(g) What is the purpose of adding alloying elements?
(h) What is cryogenic treatment?
(i) What is crystallization?
(j) Write a rule of mixture for an upper bound and lower bound.

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

UNIT ? I

2 Determine the packing factor for both FCC and BCC structure. Which structure is densely packed?
Show with sketches.
OR
3 Sketch and explain the cooling curve for solid solution with an example.

UNIT ? II

4 Sketch and explain the phase diagram illustrating the eutectoid reaction.
OR
5 Sketch and explain the cooling curve and the microstructure during the slow cooling of 65A-35B
alloy.

UNIT ? III

6 Sketch and explain the size and distribution of graphite flakes in gray iron.
OR
7 How are copper alloys classified? With a neat sketch, explain the phase diagram of Cu-Zn.

UNIT ? IV

8 Explain in brief the effect of alloying elements on iron-iron carbon system.
OR
9 Explain the process of heat treatment of plastics.

UNIT ? V

10 Explain the influence of fiber orientation and concentration on strength of composites.
OR
11 What are metal matrix composites? List its applications.

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R15
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