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Friday, 28 February 2014

Physical metallurgy- model question paper for B.E/B.Tech/M.E/M.Tech Engineering

1(a) Show that for a face centered cubic crystal packing fraction is 74%. (5 Marks)

(b) Explain the method of determination of Miller indices. (5 Marks)

(c) Explain the differences between a chemical compound, an ordered solid solution and a random solid solution. (6 Marks)

(d) Calculate the spacing between edge dislocations in a tilt boundary in iron, when the angle of misorientation between the subgrains is 2o. (4 Marks)

2 (a) State and explain Gibbs phase rule. (4 Marks)

(b) Explain why a eutectic composition does not show coring, whereas a solid solution does. (6 Marks)
(c) Draw heating curves for a proeutectic and a eutectic composition. (6 Marks)
(d) Determine the atomic percentage of Carbon in mild steel containing 0.2 weight percentage Carbon. (4 Marks)
3 (a) Explain Fick’s laws. (6 Marks)
(b) Differentiate between homogeneous nucleation and heterogeneous nucleation. What is overall transformation rate? (6 Marks)
(c) List the methods available for refining the grain size of a casting. (4 Marks)
(d) What is the purpose of tempering a quenched steel? (4 Marks)
4 (a) Differentiate between T-T-T diagrams and C-C-T diagrams. (8 Marks)
(b) Explain the process austenitization. (4 Marks)
(c) Distinguish between austempering and martempering. (4 Marks)
(d) Explain how quenching carburized steel introduces residual compressive stresses at the surface. (4 Marks)
5 (a) Write a note on slip and twinning. (4 Marks)
(b) Explain in detail different methods used for strengthening metals against yield. (8 Marks)
(c) What is Griffith’s criterion? Explain. (4 Marks)
(d) If the grain size of mild steel is changed from ASTM No.8 to 13 by microalloying additions, estimate the increase in yield strength. (4 Marks)
6 (a) Explain the working of a Galvanic cell. (5 Marks)
(b) Write notes on polarization and passivation. (6 Marks)
(c) What are the general characteristics of stress corrosion cracking? (5 Marks)
(d) A pit in a 18/8 stainless steel exposed to sea water grows to a depth of 50 mm in a year. To what average current density does this correspond? (4 Marks)
7 (a) Write a note on AISI-SAE classification of steels. (4 Marks)
(b) Define plastic anisotropy parameter. What is its significance? (6 Marks)
(c) What are the general properties required for good tools? (4 Marks)
(d) Distinguish between maraging steels and trip steels. (6 Marks)
8 (a) What is a Schaeffler diagram? (4 Marks)
(b) Whar are superalloys? Explain in detail three types of superalloys. (8 Marks)
(c) Describe the composition and heat treatment of (α+β) titanium alloys for optimum mechanical properties. (4Marks)
(d) Describe the role of hard particles, soft matrix and insoluble metals in the functioning of a bearing alloy. (4 Marks)

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