JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II THERMODYNAMICS OF MATERIALS Previous Question Paper (April - 2018 - R16)
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
Answer all questions:
Define self-diffusion and solid-state diffusion.
Answer
Self-diffusion is the migration of atoms within a pure material where all atoms are of the same species. Solid-state diffusion is the process of mass transport of atoms or molecules through a solid material, typically driven by concentration gradients, thermal energy, or structural defects.
What is meant by order of a reaction?
Answer
The order of a reaction is defined as the sum of the powers of the concentration terms in the rate law expression. It indicates how the rate of reaction depends on the concentration of the reactants and is determined experimentally rather than from the stoichiometric coefficients of the balanced chemical equation.
Differentiate between solidus line and liquidus line.
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Write the Limitations of Ellingham diagrams.
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What is phase rule and give its importance?
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What is Nernst equation and give its Importance?
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List out the applications of diffusion phenomena.
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Differentiate between pipe diffusion and lattice diffusion.
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Why Raoult’s law obeyed by solute and Henry’s law obeyed by solvent.
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What is the importance of partial molal quantities?
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Part B
Define the following with respect to diffusion phenomena: a) Concentration b) diffusion flux c) diffusivity.
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Explain the following:
Diffusion along grain boundaries.
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Diffusion along surfaces.
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Draw neatly the Ellingham diagrams for both sulphide and oxide reactions.
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Explain the following:
Explain interpretation of two more free energy change Vs. temperature lines.
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Explain briefly about the Richardson’s diagrams.
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Explain the following:
Write explanatory notes on excess thermodynamic quantities.
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Explain about Ideal and Non-Ideal solutions.
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Derive Gibbs-Duhem equation and Integration of Gibbs-Duhem equation.
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Explain the following:
Explain the chemical potentials in equilibrated phases of phase diagrams.
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Derive Gibb’s phase rule and give its importance.
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Explain the following:
Write explanatory notes on calculation of liquidus line for eutectic systems.
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Discuss briefly about chemical potentials in equilibrated phases.
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Calculate the emf of copper concentration cell in which the activities of copper in the two half cells are 0.1 and 0.01 at 270C and 770C.
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Differentiate between Galvanic cells and concentration cells.
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