Question Paper: Material Science & Metallurgy : Question Paper Dec 2014 - Mechanical Engineering (Semester 3) | Gujarat Technological University (GTU)
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Material Science & Metallurgy - Dec 2014

Mechanical Engineering (Semester 3)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
1 (a) (i) State the importance of study of "Material Science" and briefly explain engineering requirement of materials.(3 marks) 1 (a) (ii) What are slip bands and slip lines? Draw required sketches. What causes the formation of such bands on a metal surface.(4 marks) 1 (b) Explain and differentiate Edge dislocation and Screw dislocation with neat sketch.(7 marks) 2 (a) What is critical nucleus? In case of crystallization of metals, what is the difference between an embryo and a nucleus. What is the significance of critical radius of a solidifying particle?(7 marks)


Answer any one question from Q2 (b) & Q2 (c)

2 (b) Using Gibb's phase rule, explain unary phase diagram with the help of sketch.(7 marks) 2 (c) What is cooling curve? Explain and differentiate time temperature cooling curve of an alloy of eutectic composition and pure metal.(7 marks)


Answer any two question from Q3 (a), (b) & Q3 (c), (d)

3 (a) Write a short note on: "Iron-iron carbide equilibrium diagram".(7 marks) 3 (b) With the aid of an iron- iron carbide equilibrium diagram show and explain eutectic, peretectic and eutectoid transformation. Also mention the significance of these transformations.(7 marks) 3 (c) State composition, specific properties and applications of Grey Cast Iron.(7 marks) 3 (d) What is phase diagram? Explain Lever rule.(7 marks)


Answer any two question from Q4 (a), (b) & Q4 (c), (b)

4 (a) Explain the steps to obtain the TTT-diagram for eutectoid steel and show on it the cooling curve representing annealing and hardening process.(7 marks) 4 (b) What are the purpose of Alloying ? Give effects of nickel as an alloying element.(7 marks) 4 (c) Describe and compare Austempering and Martempering.(7 marks) 4 (d) Enlist the properties of pure aluminium and mention the composition, properties and application of any one aluminium alloy(7 marks)


Answer any two question from Q5(a), (b) & Q5 (c), (d)

5 (a) What is Powder Metallurgy? Explain the process of Powder Metallurgy.(7 marks) 5 (b) What do you mean by Non-destructive testing? Differentiate destructive and non-destructive testing by stating benefits and limitations.(7 marks) 5 (c) Describe with neat sketch how would you carry out a Jominy harden ability test on a steel sample.(7 marks) 5 (d) Give specific applications of powder metallurgy parts also describe merits and de-merits of powder metallurgy proess.(7 marks)

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