Download AKTU B-Tech 3rd Sem 2015-2016 NME 301 Material Science Question Paper

Attempt all parts. All parts carry equal marks. Write answer of each part in short. (2×10=20)

1. (a) What is the importance of the materials, explain briefly.
2. (b) Why do yield points occur in low carbon steel?

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3. (c) Classify different types of chemical bonds with appropriate examples.
4. (d) Write the name of all atomic models and explain any one of them.
5. (e) Differentiate between Edge dislocation and Screw dislocation.
6. (f) Why is Etchant used after polishing? Write the etchant name for Stainless steel.
7. (g) Explain smart materials & its application.

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8. (h) What is duralumin? Give the composition & their applications.
9. (i) Explain the difference between Addition polymerization and Condensation polymerization.
10. (j) A hardened steel ball of 0.50 cm diameter is used to indent a steel specimen in Brinell hardness test. Diameter of indentation measured by an optical microscope of magnification 10 X is observed to be 32.5mm. Calculate the Brinell hardness number of the steel specimen.
11. (k) Write the main difference between thermoplastics and thermosets with example.
12. (l) What do you understand by the lever rule? Determine the mass fraction of the phases present at 184° C in a sample of lead & tin with 45% tin in it.

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13. (m) Discuss the effects of alloying elements on the properties of steel.
14. (n) Explain Austempering and Martempering processes with a suitable sketch.
15. (o) What are some methods by which processing of ceramic materials is carried out? What are the applications of ceramic materials?
16. (p) What is super conductivity and super conducting transition temperature? Explain what is the Meissner effect shown by super-conduction material & what are its possible uses?
17. (q) Shown by graph Brittle & Ductile fracture of materials, Explain in brief Griffith's Theory of Brittle fracture.

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