JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech IV MATERIAL CHARACTERIZATION TECHNIQUES Previous Question Paper (July/August - 2023 - R15)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What is the difference between metallurgy and metallography?
Answer
Metallurgy is the broad science and technology of extracting metals from their ores and modifying them for use (including smelting, refining, and alloying). Metallography is the specific study of the microscopic structure and constitution of metals and alloys, primarily using optical or electron microscopy to reveal grain size, phases, and defects.
Why is metallographic testing necessary?
Answer
Metallographic testing is necessary to correlate the microstructure of a material with its mechanical and physical properties. It allows for the identification of phases, grain size, inclusion content, and heat treatment effects, which directly influence performance, failure analysis, and quality control during manufacturing.
How resolving power of a TEM is defined?
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What is spot size in SEM?
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What is Bragg’s law?
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List out X-ray properties.
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What is diffraction?
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What is XRD?
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What is Raman spectroscope?
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What are the applications of emission spectroscopy?
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Part B
Briefly discuss about properties of objectives.
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Explain the principle of phase contrast.
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What are the various steps in metallography? Explain.
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What is the importance of metallography in heat treatment?
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Differentiate between SEM and TEM.
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Explain about different types of modes used in SEM.
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Explain the applications, advantages and limitations of different modes used in SEM.
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Explain the production of X-rays with a neat sketch.
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What are the precautions to be taken in handling the X-rays?
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Explain the factors affecting the diffraction intensities.
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How crystal structure is determined by XRD.
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Briefly explain chemical analysis by diffraction.
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Explain the chief sources of error in θ in Debye-Scherrer cameras.
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List out different types of spectroscopy.
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Discuss the principle, procedure and applications of any two methods in detail.
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What is the principle of DSC?
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Differentiate between TGA, DTA and DSC?
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List out the applications of TGA, DTA and DSC.
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