Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech II METALLURGY AND MATERIALS SCIENCE Previous Question Paper (April/May - 2023 - R15)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Differentiate isomorphous and eutectic reactions.
Answer
An isomorphous reaction involves the complete solid solubility of two components in both liquid and solid states, resulting in a single-phase solid solution. A eutectic reaction involves a liquid phase transforming simultaneously into two distinct solid phases upon cooling at a specific composition and temperature.
What is the necessity of alloying?
Answer
Alloying is necessary to enhance the mechanical, physical, and chemical properties of pure metals. It is primarily used to increase strength, hardness, and wear resistance, improve corrosion resistance, modify electrical or magnetic properties, and lower the melting point for easier casting or processing.
What changes in physical and mechanical properties occur due to annealing?
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Define isomorphous system with examples.
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What are TTT diagrams?
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What are eutectic and eutectoid reactions?
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What are the α stabilizers in titanium alloys?
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Differentiate between spheroidal graphite cast iron and Gray cast iron.
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Classify composites.
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Write the applications of cermets.
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Part B
What are miller indices? How they are determined?
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Mention the types of solid solutions. Enumerate Hume-Rothary rules governing the formation of solid solutions.
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Define atomic packing factor. Sketch the unit cell of a FCC & HCP crystal structure. Derive an expression for the density of atomic packing to FCC & HCP structure.
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Explain with a neat phase diagram the eutectic reaction and peritectic reaction.
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What is cooling curve? Explain its importance on phase diagram.
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With suitable examples, explain the phase rule and lever rule.
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Draw a neat sketch of Iron-Carbide equilibrium diagram. Mention all the phases, lines and temperatures.
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What is tempering? What are the microstructural changes after tempering?
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Explain the effect of common alloying elements on steel.
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List and discuss different types of stainless steels.
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Sketch and explain any two types of cast iron, with microstructure, composition and properties.
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Explain about the structure and properties of copper and its alloys.
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Sketch and explain Al-Cu phase diagram.
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Explain the structure and properties of Titanium and its alloys.
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Sketch and explain different methods of processing ceramics.
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Distinguish between the properties of ceramics, metals and plastics.
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Define composite material. Give the classification based on matrix and reinforcement.
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What are the advantages and disadvantages of ceramics?
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