Jawaharlal Nehru Technological University Hyderabad 2007 B.E Chemical Engineering MATERIAL SCIENCE FOR CHEMICAL ENGINEERS SET 4 - Question Paper

Code No: R05220804 Set No. 4
II B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007
MATERIAL SCIENCE FOR CHEMICAL ENGINEERS
(Chemical Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1. (a) Make a plot of the melting points and boiling points of materials of various
bonding characteristics as a function of their bond length.
(b) discuss why the increasing pattern of melting and boiling points show a reversal
after silicon, even through the bond energy continues to increase. [8+8]
2. (a) Mention and discuss different steps to determine the structure of crystals.
(b) State how to determine lattice parameter of a cubic crystal by the diffraction
method. [8+8]
3. (a) What is dislocation climb?
(b) discuss jogs in dislocation.
(c) discuss Frank-Read source of dislocation. [4+6+6]
4. What is the effect of the subsequent operations on the microstructure and mechanical
properties of a ductile single-phase alloy initially in the cast and annealed condition?
(a) Increasing amount of cold work
(b) Annealing at successively higher temperatures after cold-work. [16]
5. (a) define the time-temperature-transformation characteristics of the eutectoid
steel with a suitable diagram.
(b) define the transformation of austenite to martensite and compare it to
pearlitic and bainitic transformation. [8+8]
6. (a) describe elastic deformation and anelastic deformation.
(b) describe Poisson’s ratio and shear modulus.
(c) explain about the relationship ranging from bond character and elastic modulus of
different materials. [4+4+8]
7. elaborate composite materials? elaborate the various kinds of composite materi-
als? define every 1 of them. [16]
8. (a) discuss how a galvanic couple at microstructure level may form from two
various phases in the identical material and outcome in corrosion.
(b) How does corrosion rate vary with tempering temperature? discuss with a
neat figure.
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Code No: R05220804 Set No. 4
(c) explain about metallic and nonmetallic coatings for prevention of corrosion.
[5+5+6]
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Earning:   Approval pending.