Material Engineering B.E Question Paper : jaduniv.edu.in

Name of the University : Jadavpur University
Department : Metallurgical Engineering
Degree : B.E
Subject Name : Material Engineering
Year/Sem : IV/II
Website : jaduniv.edu.in
Document Type : Model Question Paper

Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/5472-MATERIAL%20ENGINEERING.pdf

Jadavpur Material Engineering Question Paper

Bachelor Of Metallurgical Engg. Examination, 2009 :
(4th year, 2nd semester)
Time : Three hours
Full Marks : 100
Use separate answer script for each part. :

Related : Jadavpur University Testing Materials & Quality Control B.E Question Paper : www.pdfquestion.in/5471.html

PART – I

Attempt at least two questions. :
1. (a) What are the applications of copper-beryllium alloys. Discuss the microstructural features of cast and wrought copper beryllium alloys. 10
(b) Give typical composition, properties and applications of the following copper alloys :
(i) gliding metal, (ii) naval brass, (iii) phosphor bronze & (iv) cupronickel. 10

2. (a) How are the different types of aluminium alloys designated. Give atleast one example of each grade. 10
(b) What do the following treatment nomenclatures stand for name atleast one alloy for each treatment :
(i) 0, (ii) H 38, (iii) T4, (iv) T61, (iv) T85 10

3. (a) What are the chief alloying elements of titanium and how do these affect the phase diagram. 6
(b) With the help of suitable diagram explain the basic principles of heat treatment of Ti-alloys. 5
(c) Discuss at least three important Ti-alloys. 9

4. (a) Answer any four : 2×4=10
(i) Brass and not copper is used for cold rolled electrical contact springs–why?
(ii) How do you make copper-tungsten alloys? Where are they used?
(iii) Ni-steel is commonly used at cryogenic condition– justify.
(iv) FCC materials are preferred for use at low temperature – why?
(v) Suggest with reasons one ferrous and one nonferrous material for use in pipeline to carry pressurised liquid at sub zero temp.
(vi) Suggest with justification a material for making sliding/ moving electrical contact.

5. Justify any five of the following additions. 2×5=10
(i) Mo in Ni-Cr-Mo steel (AISI 4340)
(ii) W in High speed steel
(iii) Cr in High carbon high chromium steel
(iv) Mo in Cr-Mo heat resisting steel
(v) Mo in Austenitic stainless steel (AISI 316)
(vi) V in Microalloyed steel
(vii) Mn in HSLA steel.

PART – II

Answer any five questions. :
6. Briefly explain (any five only)
(i) Larson-Millar Parameter, (ii) Nicro-silal, (iii) PET,
(iv) Creep Damage tolerance parameter, (v) WC-Roll,
(vi) Y,-phase.

7. (a) Answer (any five only)
(i) Why the Carbides of W, Ti, and Ta are so hard?
(ii) Why Polythenes are transparent or translucent?
(iii) Why Turbine Blades are investment cast, rather than forged?
(iv) How does Epoxy-resin act as adhesive?
(v) Why Boiler Plate steels are deoxidized by Silicon and not Aluminium?
(vi) Why do arrhenius type relations occur during Creep?

8. (a) Write down the structural formulae of Nylon 6,6.
(ii) What is the importance of Chromium in Ni-hard?
(iii) Discuss the uses of Engineering Polymers.
(iv) How does Coble creep differ from Nabarro-Herring creep?
(v) Name two Super alloys and their special properties.

9. (i) A Magnesium-Aluminium alloy is used to make containers for fuel elements in nuclear reactors. The useful life of the containers can be considered to have ended, when a (tensile) creep strain (e) of 1% (0.01) is achieved. The life of the fuel elements is 3 years. Experiments show that at the stresses involved, the containers will last 5 years at 450°C.Show that the life of the containers will be less than the life of the fuel elements at 5000C. The activation energy (E) for creep of the alloy is 133.76 kJ. mole-1 and Gas Constant, R is 8.36 J.mole-1K-1 and L-M parameter relation can be expressed by, where, A=Arbitrary Constant, t=Time, Sec., (E/R) s = T (In A + In t – In e )

(ii) Write down the structural formulas for Vinyl chloride and vinyl acetate. Determine the mole fractions of vinyl chloride and vinyl acetate in a copolymer having a molecular weight of 10,520 g/mol and a degree of polymerisation of 160. 2×5

10. (i) Andrade relation for Creep, e = eo + a 1/3 + b t can be expressed to represent the creep strain, e In a Creep Test in which eo was 0.00222, the recorded creep strain was 0.00292 at t=10 sec and 0.00575 at1000 sec. Determine the creep strain at 5=100 sec. 4

(ii) Draw the nature of engineering stress-strain curve of Rail Steels. Some times 1% Cr in rail and/or 1% Mo are added to axel steel–Justify. 3
(iii) Draw the force diagram of Relationship of fibre tension to force resisting Projectile. How can the modern material used in bullet-proof jackets, combat the ballistic threat to security personnel and VIPs from guns and bomb splinters? 3

11. (i) Draw the typical temperature dependent variation of magnetic susceptibility (c ) for ferromagnetic and ferrimagnetic materials. 3
(ii) Explain how could you talior make the saturation magnetization of NiFe2O4 by forming solid solution with ZnFe2O4. 7

12. (i) Why BaTiO3 is an important dielectric material– Explain. 4
(ii) Give two methods of Synthesis of BaTiO3. 6