mlrinstitutions.ac.in B.Tech II Year I Sem Examinations Question Paper 2016 : MLR Institute Of Technology
Name of the Centre : MLR Institute Of Technology
Name Of The Exam : B.Tech II Year I Sem Examinations
Name Of The Subject : Thermodynamics
Year : December-2016
Document type : Sample questions Papers
Website : https://mlrinstitutions.ac.in/
Download Sample Question Paper :
Thermodynamics : https://www.pdfquestion.in/uploads/13187-TD.pdf
RVSP : https://www.pdfquestion.in/uploads/13187-RVSP.pdf
OOP Using C++ : https://www.pdfquestion.in/uploads/13187-OOP.pdf
Mechanics Of Solids : https://www.pdfquestion.in/uploads/13187-MOS.pdf
Mechanics Of Fluids : https://www.pdfquestion.in/uploads/13187-MOF.pdf
Metallurgy & Material Science : https://www.pdfquestion.in/uploads/13187-MMS.pdf
B.Tech II Year I Sem Examinations Question Paper :
Thermodynamics :
Time: 3 hours
Max.Marks :75
Related : MLR Institute Of Technology B.Tech I Year II Sem Advanced Supplementary Exam Question Paper 2016 : www.pdfquestion.in/13181.html
Note :
1. This question paper contains two parts A and B.
2. Part A is compulsory which carries 25 marks. Answer all Questions in part A.
3. Part B consists of 5 units. Answer any one full question from each unit.
4. Each question carries 10 Marks and may have a,b,c as sub questions.
Part-A :
1. a) Define an open system Give an example. Define an isolated system [2M]
b) Name two alternative methods by which the efficiency of a Carnot cycle can be increased [2M]
c) Define latent Heat of vaporization [2M]
d) State Avogadro’s law. [2M]
e) What is a thermodynamic cycle? [2M]
2. a) What is the difference between the classical and the statistical approaches to Thermodynamics? [3M]
b) What is the relationship between COP of the heat pump and refrigerator? [3M]
c) Explain the terms: super heat enthalpy, Degree of Super heat and Degree of sub cooling. [3M]
d) If atmospheric air ( at 101325 Pa) contains 21% oxygen and 79% nitrogen (vol %), what is the partial pressure of oxygen. [3M]
e) Draw P-V and T-S diagram of Otto cycle and explain different processes in the cycle. [3M]
Part-B :
3. a) A gas of mass 1.5 kg undergoes a quasi-static expansion which follows a relationship p = a + bV, where a and b are constants. The initial and final pressures are 1000 kPa and 200 kPa respectively and the corresponding volumes are 0.20 m3 and 1.20 m3. The specific internal energy of the gas is given by the relation u = l.5 pv – 85 kJ/kg
Where p is the kPa and v is in m3/kg. Calculate the net heat transfer and the maximum internal energy of the gas attained during expansion. [10M]
OR
4. State and explain the first law of thermodynamics for a closed system undergoing a cycle. What is PMM1? [10M]
5. (a) State and prove Carnot’s theorem [4M]
(b) A heat engine is used to drive a heat pump. The heat transfers from the heat engine and from the heat pump are used to heat the water circulating through the radiators of a building. The efficiency of the heat engine is 27% and the COP of the heat pump is 4. Evaluate the ratio of the heat transfer to the circulating water to the heat transfer to the heat engine. [6M]
OR
6. (a) Establish the equivalence of Kelvin – Plank and Clausius statements of second law of thermodynamics. [4M]
(b) A heat engine is used to drive a heat pump. The heat transfer from the heat engine and the heat pump are used to heat the water circulating through radiator of a building. If the COP of the heat pump is 4 and the efficiency of the heat engine is 0.3, how much heat is transferred to the radiator water for every kJ heat transferred to the heat engine? [6M]
7. a) Draw and explain phase equilibrium diagram for a pure substance on P-T coordinate.
Also indicate different regions on the diagram. [5M]
b) Write down the Vander Waal’s equation of state for real gases and how is it obtained from ideal gas equation by incorporating real gas corrections? [5M]
OR
8. In a steam power plant the condition of steam at inlet to the steam turbine is 20 bar and 3000C and the condenser pressure is 0.1 bar. Two feed water heaters operates at optimum temperatures. Determine: (i) the quality of the steam at the turbine exhaust, (ii) network per kg of steam, and (iii) cycle efficiency. Neglect pump work. [10M]
9. An engine working on the otto cycle is supplied with air at 0.1 Mpa, 350C. The compression ratio is 8, heat supplied is 2100 KJ/Kg. Calculate the maximum pressure and temperature of the cycle, the cycle efficiency and the mean effective pressure. For Cp of air =1.005 KJ/Kg K, Cv = 0.718 KJ/Kg K, R= 0.287 KJ/Kg K. [10M]
OR
10. Derive an expression for the thermal efficiency of diesel cycle and draw P-V and T-S diagrams. [10M]