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Posted By: Sriram Member Level: Diamond Posted Date: 16 Jun 2008
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2006 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech EXPERIMENTAL TECHNIQUES IN METALLOGRAPHY Set No. 1 Question paper
Code No: RR411811 Set No. 1
IV B.Tech I Semester Regular Examinations, November 2006
EXPERIMENTAL TECHNIQUES IN METALLOGRAPHY
(Metallurgy & Material Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. Describe electrolytic polishing equipment and its operation. [16]
2. (a) Why dislocations are more prone for etch pitting.
(b) Discuss in detail dislocation etch pitting. [4+12]
3. (a) What happens to the revealing of microstructures if the reflectivity of the
specimens is poor? Explain. [7]
(b) How the following are revealed after etching?
i. Grinding cracks
ii. Quenching cracks
iii. Depth of hardness. [3+3+3]
4. Compare and contrast metallurgical and biological microscopes. [16]
5. What are different components of an optical microscope? Describe them in detail.
[16]
6. (a) What is the role of condenser coil in the electron microscopy? Discuss in
detail.
(b) What is the role of magnetic coils in the electron microscope? Discuss in
detail. [8+8]
7. (a) Explain the mechanism of diffraction contrast schematically.
(b) How does selected area diffraction differ from the usual technique employed in
electron diffraction cameras? Explain how accuracy of selected area diffraction
is achieved. [6+10]
8. (a) Explain the dynamic theory of contrast in detail.
(b) Explain the Kinematical theory of diffraction. [8+8]
1 of 1
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