JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II THERMODYNAMICS AND KINETICS 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. Each question carries 10 marks and may have a, b, c as sub questions.
PART- A
State first law of thermodynamics.
Answer
The first law of thermodynamics states that energy can neither be created nor destroyed, only transformed from one form to another. For a closed system, the change in internal energy is equal to the heat added to the system minus the work done by the system.
What do you mean by thermodynamic equilibrium?
Answer
A system is in thermodynamic equilibrium when it simultaneously satisfies three conditions: mechanical equilibrium (no unbalanced forces), thermal equilibrium (uniform temperature throughout), and chemical equilibrium (no net chemical reactions or mass transfer between phases).
What is entropy?
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Write statement of Carnot’s theorem.
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Define Helmholtz and Gibbs function.
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What is Gibbs phase rule?
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List out the applications of phase rules.
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What do understand by zero order reaction?
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What is collision theory?
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Write the statement of clausius clapeyron equation.
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PART-B
An open system defined for a fixed region and a control volume are synonyms. Explain.
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Define and explain an ‘isolated system’.
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What is a Thermodynamic cycle? Explain with examples.
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What is a reversed heat engine?
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What are the two statements known as Carnot principles? State and explain them.
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A cyclic process yields 100 KJ of work. When 50 KJ of heat is being transferred to the heat sink, find the thermal efficiency of the cycle.
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What is the maximum work obtainable from two finite bodies at temperatures T1 and T2? Explain.
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What are the causes for the entropy increase? Explain.
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State and explain the third law of thermodynamics.
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Discuss the applications of third law thermodynamics.
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Prove that the Gibb’s free energy and Helmholtz free energies are functions of state.
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Draw neatly the standard free energy of formation of many oxides as a function of temperature giving important reactions?
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A container having 3 compartments contains 1 mole of gas A, 2 moles of gas B and 3 moles of gas C at same temperature, presssure (298 K and 1 atm). The partitions are lifted and gases are allowed to mix. Calculate the change in Gibb’s free energy (Assume the gases behave ideally).
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Derive the Clausius-Clapeyron equation.
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For the estimation of vapour pressure of an element/compound, which rule is a valuable empirical aid. Explain the rule in detail.
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Discuss the practical importance of Classius Clapeyron equation for liquid vapour equilibrium.
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Explain about Triple point or invariant point with an example.
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Derive an equation for specific reaction rate constant of a reaction from theory of absolute reaction rates.
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Calculate the rate of decarburization in % per hr for a steel bath 40cm deep in an open hearth furnace from the following data: i) Difference between the oxygen content at the slag metal interface and the main bath is 0.04% ii) Thickness of the metal film rich in oxygen is 0.004 cm iii) Diffusivity of oxygen = 2×104 cm2/sec.
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Explain about the effect of concentration on the reaction rate:
First order reaction
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Second order reaction
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Third order or higher order reaction.
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