Download GTU BE/B.Tech 2019 Winter 5th Sem New 2152106 Physical Metallurgy Question Paper

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Subject Code: 2152106

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER- V (New) EXAMINATION - WINTER 2019

Subject Name: Physical Metallurgy

Date: 25/11/2019

Time: 10:30 AM TO 01:00 PM

Total Marks: 70

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. Define Crystal & Unit cell. [03 MARKS]

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   2. How do you identify a crystal system using lattice parameter? [04 MARKS]
   3. What is packing factor? Determine the Atomic Packing factor of BCC. [07 MARKS]
2. 1. Draw crystal planes and direction of followings: a) (111) b) (123) c) [111] [03 MARKS]
   2. Explain constitutional supercooling. [04 MARKS]

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   3. Write a short note on Solid solution. [07 MARKS]

   OR

   1. With the concept of free energy explain the homogeneous nucleation. [07 MARKS]
   2. Give classification of steel and cast Iron. [03 MARKS]
   3. Define the term component, phase, equilibrium & degree of freedom. [04 MARKS]

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3. 1. Why concentration of carbon in a-Fe with BCC structure is less than y-Fe with FCC structure? [07 MARKS]

   OR

   1. What do you mean by curie temperature? [03 MARKS]
   2. Describe the ferrite, pearlite and cementite. [04 MARKS]

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   3. Give the Hume-Rothery’s rules for substitutional solid solution. [07 MARKS]
4. 1. Explain Allotropy of iron. [03 MARKS]
   2. Write a short note on ductile cast iron. [04 MARKS]
   3. Draw Fe-Fe3C diagram and explain all invariant reaction in this diagram. [07 MARKS]

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   OR

   1. Write effect of impurity elements on properties of steel. [03 MARKS]
   2. Where is the carbon atom located in iron lattice? [04 MARKS]
   3. Explain Gibbs’ phase rule. [07 MARKS]

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5. 1. By Gibbs’ phase rule, draw cooling curve for binary eutectic system. [03 MARKS]
   2. Explain coding of steel according to IS standard and American standard. [04 MARKS]
   3. What is Metallography? Explain specimen preparation techniques for metallography. [07 MARKS]

   OR

   1. Draw a cooling curve for pure metal. [03 MARKS]

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   2. Draw a labeled sketch of metallurgical microscope. [04 MARKS]
   3. Explain the phase diagram for Isomorphous system with example. [07 MARKS]

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