Download GTU B.Tech 2020 Winter 4th Sem 3142109 Physical Metallurgy Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 4th Sem 3142109 Physical Metallurgy Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?IV (NEW) EXAMINATION ? WINTER 2020
Subject Code:3142109 Date:11/02/2021
Subject Name:Physical Metallurgy
Time:02:30 PM TO 04:30 PM Total Marks:56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1 (a) Define: Crystal, Unit cell, lattice point
03

(b) Describe the crystal system as per the lattice parameter.
04

(c) Draw Fe-Fe3C diagram and explain all invariant reaction in this diagram.
07


Q.2 (a) Describe closest packed plane and direction for BCC and FCC.
03

(b) Draw crystal planes and direction of followings:
04
a) ( 1
0 1
) b) (3 2 1) c) [1 1 1] d) [1 1 1]

(c) Classify the cast iron according to graphite morphology and matrix
07
structure. Describe any two cast irons with composition, microstructure and
applications.




Q.3 (a) Determine the atomic packing factor for FCC structure.
03

(b) Explain constitutional supercooling.
04

(c) Explain the lever rule by using phase diagram. What is use of lever rule?
07




Q.4 (a) Define: Phase, Degree of freedom, Alloy
03

(b) Explain coding of steel according to IS standard and American standard.
04

(c) Draw cooling curve for pure metals, alloys, and eutectic and explain each
07
point of curve.



Q.5 (a) What do you mean by polymorphism in material science?
03

(b) Why FCC structure is more ductile than BCC and HCP structure?
04

(c) With the concept of free energy explain the homogeneous nucleation.
07



Q.6 (a) What do you mean by curie temperature? Give examples.
03

(b) Draw the microstructure of eutectoid steel.
04

(c) Give the Hume-Rothery's rules for substitutional solid solution.
07



Q.7 (a) Draw the graph for RN and RG versus temperature and explain the same.
03

(b) Draw phase diagram for Isomorphous system.
04

(c) What are the procedural steps to be performed to see the microstructure
07
under microstructure of any metals? What is the name of the procedure?



Q.8 (a) What is the basic difference between bright field illumination and dark field
03
illumination?
(b) Draw liquidus line, solidus line, solvus line and eutectic in phase diagram.
04
(c) Explain the phase diagram for completely soluble in liquid phase and
07
insoluble in solid phase.
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