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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. 4 Question paper
Code No: RR411811 Set No. 4
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. (a) Explain electrochemical polishing diagrammatically.
(b) Draw a rough plot of current density Vs voltage, showing different regions
during polishing. [10+6]
2. (a) How does the disturbed metal form during polishing operation.
(b) How the disturbed metal is removed?
(c) What is the effect of etchant on grain boundaries? [4+4+8]
3. (a) What is meant by polarized light? Explain in detail.
(b) How the light can be polarized? Explain? [8+8]
4. Explain in detail optical microscope objectives and eyepieces. [16]
5. (a) What is the objective lens?
(b) What is the functioning of objective?
(c) How does objective contribute to the total magnification of the microscope?
[3+6+7]
6. (a) Describe the construction of electron microscope in detail.
(b) Describe the functioning of electron microscope in detail. [8+8]
7. (a) What are the uses and advantages of dark-field images?
(b) Explain the calibration techniques of electron microscopy. [8+8]
8. (a) Derive an expression for the transmitted intensity from perfect crystal.
(b) Describe in detail special transmission techniques. [8+8]
1 of 1
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