JNTU
JNTU B.Tech II METALLURGY AND MATERIALS ENGINEERING Previous Question Paper (April/May - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
PART A
What are the different types of plain carbon steel?
Answer
Plain carbon steels are classified based on their carbon content into three main types: low carbon steel (up to 0.3% C), medium carbon steel (0.3% to 0.6% C), and high carbon steel (0.6% to 1.4% C).
What is the purpose of alloying?
Answer
Alloying is performed to improve specific mechanical and physical properties of a base metal. Its primary purposes include increasing hardness, strength, corrosion resistance, and wear resistance, as well as enhancing hardenability and high-temperature stability.
Define the phase rule.
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What is eutectic system? Give an example.
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Explain the effect of cold working on strength of a material.
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Give the importance of TTT diagrams.
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Define Fick’s first law of diffusion.
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What are extrinsic semi conductors? Give an example.
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What are polymers? How they are different from metals?
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What is a composite? How is different from alloy?
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PART B
What are the different types of cast irons? Differentiate between white and grey cast irons?
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Write the properties and applications of low carbon steels.
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Write the properties and applications of copper.
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Write in detail about different alloys of copper.
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What are isomorphous alloy systems? Explain with an example.
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Explain Lever rule with an example.
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What is coring? Write the effects of coring.
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Briefly explain the Bi-cd phase diagram.
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Briefly describe recovery, recrystallization and grain growth that take place during annealing of a cold worked metal.
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What is cryogenic treatment of alloys? Why is it done? Explain with an example.
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Compare and contrast annealing with normalizing.
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What is nitriding? Differentiate between carburizing and nitriding.
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What is diffusion? Explain Fick’s second law. Give its importance.
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Write about the applications of Fick’s law in sintering.
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What are semiconductors? Give their properties and applications.
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What is doping? Write in detail about doping of semi conductors.
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Write about the structure and properties of ceramic materials.
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Briefly describe the processing of ceramic materials.
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Classify composites. Differentiate between fibre reinforced composites and particle reinforced composites.
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What is polymerization? Explain with an example.
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