JNTU
JNTU B.Tech II PHYSICAL METALLURGY Previous Question Paper (November/December - 2017 - R13)
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 is packing factor?
Answer
The Atomic Packing Factor (APF) is the fraction of volume in a crystal structure that is occupied by constituent atoms. It is calculated as the ratio of the volume of atoms in a unit cell to the total volume of the unit cell.
Distinguish between allotropy and polymorphism.
Answer
Allotropy refers to the ability of a pure chemical element to exist in two or more different crystalline forms (e.g., iron changing from BCC to FCC). Polymorphism is a more general term describing the ability of any solid material (element or compound) to exist in more than one crystal structure.
Differentiate between metal and alloy.
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What is Vegard’s law?
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What is miscibility gap?
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Differentiate between phase rule and lever rule.
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What are the micro constituents of Fe-Fe3C diagram?
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What is strain hardening?
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What is cooling curve and give its significance?
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What is carbon equivalent and give its importance?
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Part B
Calculate the packing efficiency of HCP crystal structure.
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Discuss about relation between crystal structure and ductility.
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Lattice parameter of a cubic crystal is 3.61A0 calculate atomic density in (111), (110) and (100) planes in FCC crystals.
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Draw and classify the crystal systems with examples.
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Explain about Interstitial solid solution with suitable examples.
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Distinguish between crystal structure and microstructure.
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What is ASTM grain size and what factors effects the grain size?
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Distinguish between substitutional and interstitial solid solutions.
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Write explanatory notes on inter-metallic compounds.
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List out the applications of the phase diagrams.
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Draw and explain the Al-Cu phase diagram.
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Distinguish between isomorphous and eutectic systems.
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What are the micro constituents of iron and iron carbide diagram and define them.
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Why iron and iron carbide diagram is not a equilibrium diagram. Give reasons.
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What are the phase transformation reactions occurred in iron and iron carbide diagram?
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Define cast iron and classify it.
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Draw neatly and explain the isothermal transformation diagrams.
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Explain about Martensitic transformation.
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Discuss about the effect of alloying elements on TTT curves.
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Distinguish between TTT curves and CCT curves.
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