Jawaharlal Nehru Technological University Hyderabad 2007 B.E Chemical Engineering MATERIAL SCIENCE FOR CHEMICAL ENGINEERS SET 3 - Question Paper

Code No: R05220804 Set No. 3
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) discuss briefly the concept of free electron gas
(b) discuss Dipole moment
(c) The enthalpy of fusion of the in 6.02 kJ/mole, hydrogen bond energy is 2.05
kJ/mole and there are 2 moles of hydrogen bonds per mole of H2O in ice.
Estimate the fraction of hydrogen bonds are broken when ice melts. [6+4+6]
2. (a) State the various diffraction methods of determining the structures and provide
their advantages and disadvantages if any.
(b) obtain the Miller indices of a plain that makes an intercept of one on a- axis and
2 on b-axis and is parallel to c-axis. [8+8]
3. (a) The surface of a copper crystal is of the {1 one 1} kind. compute the surface
energy (enthalpy) of copper.
(b) Write short notes on line imperfections. [8+8]
4. (a) describe phase rule.
(b) What is the importance of phase rule?
(c) discuss in detail about thermal equilibrium diagrams. [4+4+8]
5. (a) define the transformation of austenite to martensite and compare it to
pearlitic and bainitic transformation.
(b) explain about the effect of alloying elements on the properties of steel. [8+8]
6. Explain:
(a) Normalizing
(b) Spheroidizing
(c) Annealing
(d) Tempering. [16]
7. (a) What is creep? Draw a typical creep curve and discuss the various stages of
creep.
(b) define the methods for protection against fracture. [8+8]
8. discuss the following:
(a) Intergranular corrosion
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Code No: R05220804 Set No. 3
(b) Stress corrosion
(c) Dezincification
(d) Crevice corrosion. [4×4=16]
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Earning:   Approval pending.