Download JNTUA M.Tech 1st Sem 2018 Regular Feb 9D17101 Advanced Thermodynamics Question Paper

Download JNTUA (JNTU Anantapur) M.Tech ( Master of Technology) 1st Semester 2018 Regular Feb 9D17101 Advanced Thermodynamics Previous Question Paper

Code: 9D17101


M.Tech I Semester Supplementary Examinations February/March 2018
ADVANCED THERMODYNAMICS
(Refrigeration & Air Conditioning)
(For students admitted in 2012, 2013, 2014, 2015 & 2016 only)

Time: 3 hours Max. Marks: 60

Answer any FIVE questions
All questions carry equal marks
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1 (a) What is the condition for exact differential?
(b) Why does the Gibbs function remain constant during phase transformation?

2 Write down the first and second TdS equations, derive the expression for difference of heat
capacities, Cp and Cv. What does the expression signify?

3 (a) State Daltons law of partial pressures. How the partial pressure in a gas mixture related to the mole
fraction?
(b) Find the increase in entropy when 2 kg of oxygen at 60 are mixed with 6 kg of nitrogen at the
same temperature. The initial pressure of each constituent is 103 kPa and is the same as that of the
mixture.

4 Give azeotropic mixing refrigerants for the following refrigerants. Mention the chemical formula also.
(a) R-500 (b) R-502 (c) R-503 (d) R-504.

5 (a) Deduce the expression for the available energy from the finite energy source at the temperature T
when the environmental temperature is T
0
.
(b) What is the availability referred to a cycle?

6 Consider an air compressor that receives ambient air at 100 kPa, 25 . It compresses the air to a
pressure of 1 MPa, where it exits at a temperature of 540 K. Since the air and compressor housing
are hotter than the ambient, it loses 50 KJ per kg air flowing through the compressor. Find the
reversible work, reversible heat transfer, and irreversibility of the process.
Control volume: The air compressor
Inlet state : P
i
, T
i
known; Stat fixed
Exit state : P
e
, T
e
known; Stat fixed
Process : Non-adiabatic compression with no change in kinetic or potential energy
Model : Ideal gas

7 In a gas turbine plant, working on the Brayton cycle with a regenerator of 75% effectiveness, the air
at the inlet to the compressor is at 0.1 Mpa, 30 , the pressure ratio is 6, and the maximum cycle
temperature is 900 . If the turbine and the compressor have each of an efficiency of 80%, find the
percentage increase in the cycle efficiency due to regeneration.

8 Write short notes on:
(a) Thermo-electric power generators with neat sketch.
(b) Solar photo voltaic cell power plant with necessary diagram.

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