MMEPI101/MMECM101/MMEMP101 Advanced Engineering Materials & Processing M.Tech Model Question Paper : mgu.ac.in

Name of the College : Mahatma Gandhi University
Department : Mechanical Engineering
Subject Code/Name : MMEPI 101/MMECM 101/MMEMP 101/ADVANCED ENGINEERING MATERIALS AND PROCESSING
Sem : I
Website : mgu.ac.in
Document Type : Model Question Paper

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Advanced Engineering Materials & Processing :

M. TECH. DEGREE EXAMINATION, MODEL QUESTION PAPER – II :
First Semester :
Branch: Mechanical Engineering

Related : MGU MMECM105-3 Rapid Prototyping M.Tech Model Question Paper : www.pdfquestion.in/5071.html

Specialisation: Production and Industrial Engineering / Advanced Manufacturing and Production Management / Computer Integrated Manufacturing
MMEPI 101 / MMECM 101 / MMEMP 101 – ADVANCED ENGINEERING MATERIALS AND PROCESSING
(Regular – 2013 Admissions)
Time: Three Hours
Maximum: 100 Marks
(Answer all questions)
Module -1 :
1. a. What is the attributes elastic modulus on metal cutting process? Explain with Ti machining as an example (5 marks).
b. Diamond is the hardest known mineral comment why? Derive its atomic packing factor; its APF cannot be enhanced? Why (5 marks).

c. Derive linear density expressions for FCC [100] and [111] and directions in terms of the atomic radius R. (10 marks).
d. Rhodium has an atomic radius of 0.1345 nm (1.345A°) and a density of 12.41 g/cm3. Determine whether it has an FCC or BCC crystal structure (5 marks).
OR

2. a. Why ionic and covalent bonded materials are poor conductors? Draw electronic configurations (3 marks).
b. Describe the significance of long range and short range order of atomic arrangement on mechanical strength (2 marks).

c. The planar density of the (112) plane in BCC iron is 9.94 ´ 1014 atoms/cm2. Calculate (1) the planar density of the (110) plane and (2) the interplanar spacings for both the (112) and (110) planes. On which plane would slip normally occur? (10 marks)

d. Titanium has an HCP unit cell for which the ratio of the lattice parameters c/a is 1.58. If the radius of the Ti atom is 0.1445 nm, (a) determine the unit cell volume, and (b) calculate the density of Ti and compare it with the literature value (10 marks).

Module -2 :
3. a. Calculate the concentration of vacancies in copper at room temperature (25oC). What temperature will be needed to heat treat copper such that the concentration of vacancies produced will be 1000 times more than the equilibrium concentration of vacancies at room temperature? Assume that 20,000 cal are required to produce a mole of vacancies in copper (5marks).

b. What are the specialties of intermetallic compounds and explain strengthening mechanism with neat sketches. Explain Mg – Pb phase diagram (10 marks)

c. Compare between the HAZ hardness distributions of a fusion welded steel joint and maraging steel in welded in the aged condition with neat figures (5 marks)
d. Explain the deformation mechanisms for ceramic materials and draw and explain AmXP – type crystal structures (5 marks)
OR
4. a. We wish to produce a rod composed of a single crystal of pure aluminum, which has a critical resolved shear stress of 148 psi. We would like to orient the rod in such a manner that, when an axial stress of 500 psi is applied, the rod deforms by slip in a 45o direction to the axis of the rod and actuates a sensor that detects the overload. Design the rod and a method by which it might be produced (5 marks).

b. What are the specialties of intermetallics? Draw and explain in detail the Copper – Zinc phase diagram (10 marks)
c. Explain in detail the reactions in austenite and autenite to martensite transformations in maraging steel with neat sketches. (5 marks)

d. Describe with neat sketches the mechanism involved with the Metastable ZrO2 in crack arrest and draw and explain unit cell for Fluorite (CaF2) crystal structure (5 marks)

Module – 3 :
5. a. Narrate the effects of different phases in super alloys (10 marks)
b. Explain the conditions for freckle formation (5 marks)
c. Explain the effect of grain-boundary carbides in Nickel-base super alloys (5 marks)
d. What is the maximum service temperature of molybdenum alloys in structural applications? What is TZM, narrate the applications (5 marks).
OR

6. a. Explain the major phases of nickel-base alloys (12 marks).
b. Explain in detail the effect of alloy elements and micro structural effects in super alloys (8 marks).
c. Explain the unique properties of molybdenum alloys are utilized in different applications (5 marks).

Module – 4 :
7. a. Describe the effects of different alloying elements on phase diagrams of titanium alloys (10 marks).
b. Explain the different weld imperfections produced in fusion welding of titanium (10 marks).
c. The ESR process gives rise to considerably less shrinkage pipe than the VAR process. Why is this? (5 marks).
OR

8. a. Explain Ti-based different binary phase diagram with neat sketches. Explain the alloy Ti-6Al-4V (8 marks).
b. Explain the basic slip and twinning modes in titanium (5 marks).

c. A closed-die forging operation on a piece of a superalloy billet leaves a characteristic grain size distribution, which depends upon the thermal and strain history induced. Describe what this might look like. Will the grain size be greater at the rim or the bore region? (12 marks).