GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
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Subject Code:2172109 Date:30/01/2021Subject Name:Materials Characterization
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
Q.1 (a) State the importance of materials characterization. 03
(b) Write the difference between Positive Replica and Negative Replica. 04
(c) Write short note on Differential Thermal Analysis. 07
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Q.2 (a) What is the purpose of molecular sieve in sorption pump? 03
(b) What do you understand by vertical resolution? 04
(c) Explain in detail the principle, working, advantages and applications of SEM 07
Q.3 (a) Explain the phenomenon of cryotrapping. 03
(b) Write short note on Colour Metallography 04
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(c) What do you understand by optical Aberration? Explain the off axis aberrations with its remedies in detail. 07Q.4 (a) Draw the schematic diagram illustrating the principle of Metallurgical microscope. 03
(b) List the application of Transmission Electron Microscopy. 04
(c) Write short note on field ion microscopy. 07
Q.5 (a) Write short note on formvar replica. 03
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(b) Explain the technique that can be used for the observation of liquation of constituents. 04(c) Explain Electron Probe Micro Analysis (EPMA) in detail. 07
Q.6 (a) State the electrolyte and conditions for electrolytic polishing to prepare replica. 03
(b) Write short note on Image Analyzer. 04
(c) What is X-ray diffraction? Derive Bragg’s law. 07
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Q.7 (a) Explain the terminology 1) Numerical Aperture 2) Resolving power 03
(b) Which technique is used to find out the elemental analysis of geological material? Explain its principle in brief. 04
(c) Explain the application of XPS (ESCA) for material characterization 07
Q.8 a) Draw a schematic diagram of arrangement of TMA. 03
(b) State the working principle of Turbo molecular pump. 04
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(c) Differentiate between EDS and WDS. 07--- Content provided by FirstRanker.com ---
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