JNTU
JNTU B.Tech III THERMODYNAMICS FOR PETROLEUM ENGINEERS Previous Question Paper (May - 2018 - R15)
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.
PART - A
Define the terms pressure and energy?
Answer
Pressure is defined as the normal force exerted by a fluid per unit surface area. Energy is the capacity of a system to perform work or produce heat.
What is intensive property? Give two examples.
Answer
An intensive property is a physical property of a system that does not depend on the amount of matter present or the size of the system. Examples include temperature and pressure.
Define the efficiency of a heat engine?
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What is equation of state? Give examples.
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Define ‘compression’ and ‘expansion’ processes?
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Write the significance of Mollier diagram.
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What is the physical meaning of ‘fugacity’?
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What is the importance of excess properties?
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Give one example for LLE.
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What is Raoult’s law?
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PART - B
Define work? Derive the equation for work and show that
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A tank containing 20 kg of water at 293.15 K is fitted with a stirrer that delivers work to the water at the rate of 0.25 kW. How long does it take for the temperature of the water to rise to 303.15 K if no heat is lost from the water? For water, Cp = 4.18 kJ/ kg 0C
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Define second law of thermodynamics and give the limitations of the first law.
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An engine using hot spring water at 330 K as the heat source receives 420 kJ and is said to reject 335 kJ to melting ice at 273 K. Comment on the engine efficiency?
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Generally, volume expansivity β and isothermal compressibility κ depend on T and P, Prove that:
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Discuss about thermodynamic temperature scales.
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Define entropy? How the entropy change in an irreversible process determined?
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Explain about third law of thermodynamics.
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Air expands adiabatically through a nozzle from a negligible initial velocity to a final velocity of 325 m/s. What is the temperature drop of the air, if air is assumed to be an ideal gas for which Cp = (7/2)R?
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The molar volume (cm3/ mol) of a binary liquid mixture at T and P is given by:
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Define the term ‘chemical potential’? Derive the criterion for phase equilibrium in terms of chemical potential.
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If the molar density of a binary mixture is given by the empirical expression:
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What is VLLE? Discuss about VLLE with neat phase diagram.
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Derive the equations to estimate the properties of fluids from the cubic equations of state.
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