Deemed University 2011 B.Tech Mechanical Engineering University: Lingayas University Term: V Title of the : Engineering Materials - Question Paper
Roll No. ..
Lingayas University
B.Tech. 2nd Year (Term V)
Examination Feb 2011
Engineering Materials (ME - 208)
[Time: 3 Hours] [Max. Marks: 100]
Before answering the question, candidate should ensure that they have been supplied the correct and complete question paper. No complaint in this regard, will be entertained after examination.
Note: Attempt five questions in all. All questions carry equal marks. Question no. 1 is compulsory. Select two questions from Section B and two questions from Section C.
Section A
Q-1. Part - A
Select the correct answer of the following multiple choice questions. [10x1=10]
(i) Which of the following is an organic material?
(a) Wood (b) Zinc
(c) Copper (d) Iron
(ii) MgO is the
(a) Alloy (b) Ceramic
(c) Metal (d) Composite
(iii) Internal combustion engine pistons are made of Y alloy containing
(a) Al+Ni+Cu+Mg (b) Al+Cu+Zn
(c) Al+Cu+Cr+Sn (d) Al+Cu+Ni+Sn
(iv) Malleability is the property of metals known as
(a) Magnetic property (b) Mechanical property
(c) Technological property (d) Thermal property
(v) The capacity of a material to undergo deformation under tension without rupture is
(a) Mechanical strength (b) Stiffness
(c) Toughness (d) Ductility
(vi) Which allotropic form of iron not having BCC structure is
(a) Alpha iron (b) Beta iron
(c) Gamma iron (d) Delta iron
(vii) The process of heating hardened steel to any temperature below the lower critical temperature and then cooling at desired rate is known as
(a) Annealing (b) Normalizing
(c) Tempering (d) Hardening
(viii) Which of the following process is used for heat treatment of castings?
(a) Tempering (b) Annealing
(c) Electroplating (d) Normalizing
(ix) Main alloying element in stainless steel, which makes it corrosion resistant
(a) Nickel (b) Copper
(c) Chromium (d) Vanadium
(x) Boiler plate are generally made of
(a) Dead mild steel (b) Mild steel
(c) Medium carbon steel (d) High carbon steel
Part - B
(a) Explain with examples, three most common lattices observed in metals. [5]
(b) Find the relation between unit cubic cell size and atomic radius for an FCC lattice. [5]
Section B
Q-2. (a) Differentiate between edge and screw dislocations with the help of neat sketches.
(b) Classify lattice defects and explain in detail point defects found in crystalline metals. [2x10=20]
Q-3. With neat sketch explain the Fe-C equilibrium diagram.
[20]
Q-4. (a) Explain in detail the mechanism of plastic deformation in metals. [10]
(b) What do you mean by yield point phenomenon? [5]
(c) Write a short note on Bauschinger effect. [5]
Section C
Q-5. (a) Explain the difference between annealing and normalizing and need for each.
(b) Discuss the carburizing process in detail. [2x10=20]
Q-6. (a) Classify various types of corrosion. How can it be controlled?
(b) How is the fatigue test performed? Differentiate between fatigue limit and fatigue strength. [2x10=20]
Q-7. (a) Write a note on types of stainless steels explaining mechanical properties and applications of each.
(b) What is the principle of operation of ultrasonic testing? Also discuss the merits and demerits of ultrasonic testing of metals. [2x10=20]
Q-8. (a) Explain the Lever rule.
(b) What is Creep? Discuss the mechanisms of Creep. [2x10=20]
| Earning: Approval pending. |
