JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year THERMODYNAMICS FOR PETROLEUM ENGINEERS Previous Question Paper (November/December - 2017 - R15)

Differentiate between reversible process and irreversible process with suitable example.

Show that the internal energy is a point function and does not depend on path followed.

What is the importance of virial equation to study the behavior of ideal gases?

State and explain the Kelvin Planck statement of second law of thermodynamics.

How to estimate the actual work and ideal work for the turbine and compressor?

What are the residual stresses in the material? Explain the significance.

What are the models used for the estimation of excess Gibbs free energy?

Differentiate between SLE and SVE based on the phase diagrams.

How to estimate the properties of the fluid from different correlations? Explain.

Explain the phase equilibrium and stability of the processes.

What do you understand by the terms work transfer and heat transfer? Discuss them on the p-v and T-s diagrams.

A compressed air bottle of volume 0.15 m³ contains air at 40 bar and 27^oC. it is used to drive a turbine which exhausts to atmosphere at 1 bar. If the pressure in the bottle is allowed to fall to 2 bar, determine the amount of work that could be delivered by the turbine.

A blower handles 1 kg/s of air at 20^oC and consumes a power of 15 kW. The inlet and outlet velocities of air are 100 m/s and 150 m/s respectively. Find the exit air temperature, assuming adiabatic conditions. Take C_p of air is 1.005 kJ/kgK.

What is thermodynamic equilibrium? What is its importance in understanding the thermodynamic properties of the system?

Show that the Kelvin Planck statement and Clausius statement of second law of thermodynamics is same.

Draw the PVT surfaces for the pure substances and explain the importance of these surfaces.

What is the difference between absolute temperature scale and thermodynamic temperature scale? Explain.

A reversible heat engine operates between two reservoirs at temperatures of 650^oC and 40^oC. The engine drives a reversible refrigerator which operates between reservoirs at temperatures of 40^oC and 20^oC. The heat engine is 2000 kJ and the net work output of the combined engine refrigerator plant is 350 kJ. Evaluate the heat transfer to the refrigerant and the net heat transfer to the reservoir at 40^oC.

State the importance of third law of thermodynamics and how does it help in understanding the term absolute entropy.

A pump forces 1.2 m/min of water horizontally from an open well to a closed tank where the pressure is 0.9 MPa. Compute the work the pump must do upon the water in an hour just to force the water into the tank against the pressure.

What is pure substance? How to calculate properties of pure substance? Explain the importance of Mollier Diagram.

Steam enters a steam turbine with a velocity of 16 m/s and specific enthalpy 2990 kJ/kg. The steam leaves the turbine with a velocity of 37 m/s and specific enthalpy of 2530 kJ/kg. The heat lost to the surroundings is 25 kJ/kg with the steam flow rate of 3,60,000 kg/hr. Calculate the turbine work output in kW.

How to estimate the fugacity coefficients for the mixtures? Discuss with an example.

By definition, the partial molar volume is as shown. What physical interpretation can be given to this equation? Discuss.

Discuss how to calculate the properties of fluids from the correlations of the Pitzer type and explain the importance of these relations.

Determine the individual gas constant and the molecular weight of a mixture containing 20% Oxygen, 20% Nitrogen and 60% Carbon dioxide on volume basis.

Discuss about LLE and draw its solubility diagrams represented in the form of an island.

A vessel divided into two parts by a partition, contains 4 mol of N₂ gas at 80^oC and 35 bar on one side and 3.5 mol of argon gas at 120^oC and 24 bar on the other. If the partition is removed and the gases mix adiabatically and completely, what is the change in entropy? Assume Nitrogen and Argon behave as ideal gas with C_v = 5/2 R for N₂ and C_v = 3/2 R for argon.

State and explain Duhem’s theorem and discuss the importance of this theorem.

Draw the phase equilibrium diagram for a mixture of Aqua ammonia solution at one pressure and discuss method to calculate liquid and vapour fractions based on bubble point and dew point temperatures.