GTU previous years question papers -BE- Sem-III -Material Science & Metallurgy -May 2012

GTU previous years question papers

GUJARAT TECHNOLOGICAL UNIVERSITY

BE SEM-III Examination May 2012

Subject code: 131904

Subject Name: Material Science & Metallurgy

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) What is Gibb’s phase rule? Explain its importance. 5

(b) Draw microstructure of (i) 04 % carbon steel and (ii) eutectoid steel at room temperature. 5

(c) Draw iron – iron carbide equilibrium diagram with all necessary details. Briefly explain cooling of 1.2 % carbon steel from liquid state to room temperature. 4

Q.2 (a) Discuss the advantages, disadvantages and limitations of powder metallurgy. 07

(b) Describe with neat sketch how would you carry out a Jominy harden ability test on a steel sample. 07

OR

(b) i. Briefly explain why ferritic and austenitic stainless steels are not heat treatable.

ii Distinguish between hardness and harden ability 07

Q.3 (a) Draw TTT diagram for eutectoid steel. Explain it briefly by considering few cooling rates.      5

(b) Differentiate between austempering and martempering. 5

(c) Case carburizing heat treatment is not generally carried out for medium carbon steels. Why? 4

OR

Q.3 (a) Explain allotropic transformation of iron. 5

(b) What is solid solution? Discuss in brief types of solid solution with neat sketch.5

(c) What are the factors affecting hardnability? 4

Q.4 (a) What is cooling curve? How does the time temperature cooling curve of an alloy of eutectic composition different from that of a pure metal?       5

(b) Explain with neat sketches the arrangement of atoms in B.C.C, F.C.C. and H.C.P. lattice. Define unit cell. Show that a F.C.C. structure is always more close packed than B.C.C. structure.  5

(c) Explain use of Galvanic series 4

OR

Q.4 (a) Explain with neat sketches steps involved in preparing specimen for microscopic examination. 5

(b) Enlist methods of manufacturing metal powder. Discuss any one in detail. 5

(c) Explain modified aluminum silicon alloys. 4

Q.5 (a) How will you classify brasses based on the composition of zinc Explain the properties & application of the main

type of brasses.                 5

(b) Explain Cathodic protection against corrosion. 5

(c) Enlist properties of a good bearing material. 4

OR

Q.5 (a) Enlist different method of metal coating for corrosion prevention. Discuss any one in detail. 5

(b) Classify types of cast iron. Discuss any on. Draw its microstructure also. 5

(c) Explain flame-hardening process in brief 4

 

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