JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II THERMODYNAMICS OF MATERIALS Previous Question Paper (May - 2019 - R16)
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. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
List out the advantages of phase diagrams.
Answer
Phase diagrams provide a graphical representation of phase stability as a function of temperature, pressure, and composition. They are essential for predicting microstructural evolution, determining solubility limits, and designing heat treatment processes for materials.
What is the importance of chemical potential?
Answer
Chemical potential acts as the driving force for mass transfer, diffusion, and phase transformations. It defines the equilibrium state of a system, as equilibrium is reached when the chemical potential of each component is uniform throughout all phases present.
Write the significance of Ellingham diagram.
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What is the importance of thermodynamics to Electro-Chemical cells?
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Define Half-cell potential and standard electrode potential.
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What is catalyst and give some examples?
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Differentiate between Ideal and Non-ideal solutions.
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Distinguish between self-diffusion and solid-state diffusion.
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What is decomposition potential?
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What are the factors effects the diffusion coefficient?
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Part B
What are the macroscopic laws of diffusion? Explain.
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Explain how the oxidation of a metal is controlled by the diffusion rate of atoms (or ions) through the surface layer.
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Explain about self-diffusion in pure metals.
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Write a note on Kirkendal effect and Darkes’s equations.
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Is it possible to predict the range of stability of a metallic oxide from Ellingham’s diagram? How can the
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What do breaks (discontinuities) in the above curve represent?
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What are the limitations of
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Explain how entropy and enthalpy are calculated form Ellingham’s diagram?
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Briefly discuss about Richardson’s diagrams.
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What is Sieverts law and give its importance.
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Derive partial molal quantities and give its importance.
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Define Regular solution and explain about regular solution with suitable examples.
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How composition of a solution can be measured?
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What is the significance of phase rule discuss its applications and limitations?
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Explain how the liquidus line is obtained for a eutectic system?
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What is phase diagram and give its importance and limitations?
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Distinguish between liquidus line and solidus line.
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Explain about the reversible & irreversible cells in detail with suitable example.
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Explain about the applications of Gibbs-Helmholtz equation to Galvanic cells.
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Explain about electro chemical cells with suitable example.
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Distinguish between electro chemical cell and electrolytic cell.
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