Question Papers Metallurgy and Material Science Jntu Previous Years
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METALLURGY AND MATERIAL SCIENCE JNTU previous years question papers Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1. (a) Name and discuss atleast four important metallic properties? (b) What causes metals to show alloying behavior? [8+8] 2. (a) If two metals show only limited solid solubility in each other, is it a positive or negative diviation from ideality? Explain. (b) Explain why complete solid solubility is not possible in an interstitial solid solution.[8+8] 3. (a) Define cast irons ? Explain the cooling history of 4.3% C in Fe-Fe3C system by drawing cooling curve? (b) Calculate proportionate of different phases for 2.8%C in Fe-Fe3C diagram at 12000C, 11730C, and 6000C. Also draw the microstructures at room temperature? [6+10]
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Transcript of Question Papers Metallurgy and Material Science Jntu Previous Years
METALLURGY AND MATERIAL SCIENCE JNTU previous years question papers
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Name and discuss atleast four important metallic properties?(b) What causes metals to show alloying behavior? [8+8]
2. (a) If two metals show only limited solid solubility in each other, is it a positive or negative diviation from ideality? Explain.(b) Explain why complete solid solubility is not possible in an interstitial solid solution.[8+8]
3. (a) Define cast irons ? Explain the cooling history of 4.3% C in Fe-Fe3C system by drawing cooling curve?(b) Calculate proportionate of different phases for 2.8%C in Fe-Fe3C diagram at 12000C, 11730C, and 6000C. Also draw the microstructures at room temperature? [6+10]
4. (a) What is maraging? How the strength is achieved in maraging steels with low percentage of carbon?(b) Give the composition of maraging steels and explain the role of cobalt in such steels? [8+8]
5. (a) Distinguish between hardness and hardenability.(b) Critically discuss Pack carburizing of steels. [5+11]
6. (a) What is season cracking? How season cracking is eliminated?(b) Discus the following alloys:i. Cartridge brassii. Muntz metal andiii. Tobin bronze. [4+12]
7. (a) What are naturally occuring ceramics? Give examples and explain.(b) Explain the structure and properties of glass ceramic materials. [6+10]
8. (a) Composite materials are ideally suited for many engineering applications, “Designer’s choice”. Discuss.(b) What is a fuel cell? What is its importance. [12+4]
METALLURGY AND MATERIAL SCIENCE JNTU previous years question papers
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Name and discuss atleast four important metallic properties?(b) What causes metals to show alloying behavior? [8+8]
2. (a) Differentiate between a single crystal and polycrystalline material?(b) Explain why fine grained materials have superior properties than coarse grained materials?(c) Explain the purpose of etching in metallographic examination? [6+6+4]
3. (a) Write short notes on:i. Austeniteii. Alpha ferriteiii. Delta ferriteiv. Cementite(b) Write the allotropy nature of iron with temperature
and also explain the effect of pressure on allotropy of iron? [8+8]
4. (a) Write in detail about hot working tool steels and cold working tool steels?(b) Write in detail about nickel steels? [8+8]
5. (a) Carburized components are subjected to subsequent hardening heat treatment. However, nitrided articles will not be heat treated subsequently. Explain why?(b) What is chemical heat treatment? Explain how it is done? What are the properties of cyamided case? [6+10]
6. Discuss the following alloys:(a) Cupronickels(b) Beryllium Bronzes. [8+8]
7. (a) Briefly explain few mechanical properties of ceramic materials. Also describe how the strength of the glass can be increased.(b) Discuss briefly glass forming. [10+6]
8. (a) What is the purpose of reinforcements? Describe different types of reinforcements in composites.(b) Suggest an appropriate matrix to be used for the following fiber types with proper instification:i. SiC,
ii. Polyethyleneiii. E-glass. [10+6]
METALLURGY AND MATERIAL SCIENCE JNTU previous years question papers
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) The distance between (111) plane in FCC crystal is 2A0. Find out lattice parameter and atomic diameter?(b) Describe briefly miller bravais indices?(c) Distinguish between space lattice and crystal structure?(d) Give the relation between lattice parameter ‘a’ and atomic radius ‘r’ for simple cubic, BCC, FCC and HCP with examples? [4+4+4+4]
2. (a) What are intermediate phases? Discuss various types of intermediate phases?(b) What is the importance of ratio of radius of interstitial to solvent atom in interstitial compounds? [8+8]
3. (a) Explain the procedure of preparation of steel samples for metallographic examination?(b) Under Microscope grain boundaries appear black. Why?(c) Ferrite and Cementite both etch white but their mixture pearlite normally appears as black and white plates. Why? [8+4+4]
4. (a) Give the typical composition of white cast iron?(b) Explain the malleabilizing treatment given to white cast Iron with a neat sketch?(c) Explain the composition, microstructure and properties of gray cast Iron?[2+7+7]
5. (a) Distinguish between an alloy and a solid solution.(b) Compare and contrast annealing and normalizing treatments. [4+12]
6. (a) Distinguish between manganese bronze and aluminium bronze. Mention their properties and uses.(b) Discuss briefly:i. 70:30 Brass andii. Muntz metal. [8+8]
7. (a) In a heterogeneous multiphase refractory, what are the microstructural features present? Mention their applications.(b) Why chemically synthesized magnesium-aluminate
spinel is used exclusively as refractory in molten salt electrolysis cell for producing magnesium? [10+6]
8. (a) What are the characteristics of Al-MMC-continuous filament? Mention their applications.(b) Describe briefly any two important methods of component manufacture of composites. [6+10]
METALLURGY AND MATERIAL SCIENCE JNTU previous years question papers
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Show a (111) plane in a unit cell of cubic crystal. Also show all the directions of < 110 > which lie on the plane. Give their miller indices?(b) Calculate miller indices if a plane cuts tetragonal crystal in 3A0 on X - axis, 4A0 on Y - axis and 3A0 on Z - axis but the c/a ratio is 1.5. [8+8]
2. (a) Distinguish between commercially pure metal and an alloy?(b) What is a master alloy? What are its chief
characteristics?(c) Justify the statement “ Alloy is a material which is expected of a metal, but it is not a pure metallic element”. [6+6+4]
3. Discuss the effect of carbon on:(a) Easy melting of cast iron as compared to steel?(b) Introduction of eutectoid reaction not taking place in pure iron?(c) Increasing strength in slowly cooled steels?(d) Increase in the transition temperature. [4+4+4+4]
4. Distinguish between malleable Iron and ductile iron in terms of(a) Manufacturing Process(b) Structure(c) Properties(d) Applications. [4+4+4+4]
5. (a) What is the effect of inadequate time of soaking of steel even at appropriate temperature of hardened steel?(b) “Much of the versatility of steel as an engineering material arises from the fact that it is amenable to heat treatment”. If so, elucidate this statement with reasons. [4+12]
6. (a) Compare and contrast Brasses with Bronzes.(b) What is the role of phosphorous in bronzes? [12+4]
7. (a) Compare conventional ceramics with advanced ceramics.(b) Discuss briefly the structure, properties and applications of any one pure oxide ceramics. [10+6]
8. (a) Increased wettability and preventation of chemical reactions between the fiber and the matrix at high temperatures are very much desired. Explain how to achieve them.(b) What are In-situ metal matrix composites? Describe them briefly. [10+6]
