JNTU
JNTU B.Tech II THERMODYNAMICS OF MATERIALS Previous Question Paper (April/May - 2023 - R16)
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
Write the applications of Fick’s Law of Diffusion.
Answer
Fick's laws are used to model processes such as carburization of steel, homogenization of alloys, sintering of powder metallurgy parts, and the kinetics of oxidation and corrosion.
Define Self Diffusion and solid-state Diffusion.
Answer
Self-diffusion is the migration of atoms within a pure material where the diffusing species is the same as the host lattice atoms. Solid-state diffusion refers to the movement of atoms through a solid crystalline lattice, typically driven by concentration gradients, thermal energy, and vacancy mechanisms.
Write the limitations of Ellingham diagrams.
Answer
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Briefly explain about the Richardson’s diagram.
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Write a short note on Raoults Law.
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What is Sieverts law, write its importance?
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Differentiate between solidus line and liquidus line.
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Write the importance of solidus line during the solidification of a eutectic alloy.
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Write a short note on electro chemical cells.
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Define half-cell potential and standard electrode potential.
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Part B
Explain in detail the macroscopic laws of diffusion.
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Discuss in detail about intrinsic diffusivities.
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Explain the process of interpretation of free energy change verses temperature line.
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Write the method of calculation of equilibrium constant from standard energy changes.
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What is a regular solution, explain in detail about regular solutions with examples?
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Derive Gibb's - Duhem equation and also write the integration of Gibb's - Duhem equation.
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Explain the calculations of liquidus line for eutectic system with suitable examples.
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Draw a phase diagram with all the important lines and write its importance and limitations.
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Explain Galvanic cell with suitable line diagram.
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Discuss in detail reversible and irreversible cells with suitable example.
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