Seat No.: ________ Enrolment No.
___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER–III (NEW) - EXAMINATION – SUMMER 2017
Subject Code: 2132004 Date: 05/06/2017
Subject Name: Principles Of Materials Science And Physical Metallurgy
Time: 10:30 AM to 01:30 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (A) Answer following : 07
1 What is unit cell? What is lattice parameter?
2 What is a solid solution?
3 Define a phase? What is Gibbs phase rule?
4 What is an alloy?
5 Define fatigue and creep.
6 Define micro examination.
7 Define and interpretate APF.
(B) Choose appropriate correct answer : 07
8 Which test is used to measure hardness?
(a) Rockwell (c) Brinell
(b) Vickers (d) All of above
9 Brass is an alloy of
(a) copper and zinc (c) copper, tin and zinc
(b) copper and tin (d) none of these
10 Which one of the following is not a strong bond?
(a) van der Waals bond (c) Covalent bond
(b) Metallic bond (d) Ionic bond
11 Coordination number for closest packed crystal structure
(a) 16 (c) 12
(b) 8 (d) 4
12 Eutectic product in Fe-C system is called
(a) Pearlite (c) Ledeburite
(b) Bainite (d) Spheroidite
13 Time dependent yield is known as
(a) Fracture (c) Fatigue
(b) Buckling (d) Creep
14 Brittle fracture is more dangerous than ductile fracture because
_______________.
(a) No warning sign (c) Crack propagates at very
high speeds
(b) No need for extra (d) All
stress during crack
propagation
Q.2 (a) Explain the need of material science in Engineering 03
applications.
(b) What is the importance of Structure-property-performance 04
1
relationship?
(c) Explain the procedure to get Miller indices for 07
Crystallographic planes and directions with suitable
example.
OR
(c) Briefly explain single crystal, polycrystalline and non- 07
crystalline materials. Also explain the isotropy and
anisotropy of material.
Q.3 (a) Derive Bragg’s Law. 03
(b) Explain the material selection process for Air craft skin. 04
(c) Explain LPT with principle, methodology, application and 07
Limitations.
OR
Q.3 (a) Enlist various point defects and explain the same. 03
(b) Explain the material selection process for Fizzy drink 04
bottle.
(c) Explain MPT with principle, methodology, application and 07
Limitations.
Q.4 (a) Explain the ductile and brittle failures with relevant 03
diagram.
(b) What is creep? Explain the factors affecting it. 04
(c) Explain Eutectic, Eutectoid, Peritectic and Peritectoid 07
Systems.
OR
Q.4 (a) Enlist the various techniques for powder production. 03
Explain any one with neat sketch.
(b) Give the overview Hardening, tempering and normalizing 04
processes.
(c) Draw iron-iron carbide equilibrium diagram with all 07
necessary details. Briefly explain cooling of 0.8 % carbon
steel from liquid state to room temperature.
Q.5 (a) Density of Lead is 11.36 gm/cm3. Its atomic weight is 03
207.19 gm/mole. Calculate the lattice parameter and the
atomic radius if the structure is FCC.
(b) Draw cooling curve of (i) pure metal and (ii) An alloy of 04
two metals which are completely soluble in liquid and
solid phase.
(c) Explain Induction and flame hardening processes, also 07
give its applications.
OR
Q.5 (a) Differentiate between carburizing and nitriding. 03
(b) Draw Time Temperature Transformation diagram for 04
Eutectoid steel. Explain it briefly by considering few
cooling rates.
(c) What is the use of Jominy hardenability test? Explain in 07
Detail.
*************
