Download AKTU B-Tech 3rd Sem 2018-2019 Thermodynamics Rme 302 Question Paper

Subject Code: RME-302

Printed Pages: 02

Paper Id: 140302

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Time: 3 Hours

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B TECH (SEM-111) THEORY EXAMINATION 2018-19

THERMODYNAMICS

Note: Attempt all Sections. If require any missing data; then choose suitably.

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SECTION A

1. Attempt all questions briefly 2x7=14
   1. Differentiate between intensive and extensive properties.
   2. What do you mean by Joule-Thompson coefficient and Inversion curve?
   3. State Kelvin Planck and Clausius statement of second law of thermodynamics.
   4. What is refrigeration and What are the required properties of a refrigerant?

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   5. What do you mean by available and unavailable energy?
   6. What is the difference between the critical point and the triple point?
   7. Explain what you understand by thermodynamic equilibrium.

SECTION B

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2. Attempt any three of the following: 7x3=21
   1. A heat pump is used to meet the heating requirements of a house and maintain it at 20°C. On a day when the outdoor air temperature drops to 2°C, the house is estimated to lose heat at a rate of 80,000 kJ/h. If the heat pump under these conditions has a COP of 2.5 determine (a) the power consumed by the heat pump and (b) the rate at which heat is absorbed from the outside air.
   2. When a man returns to his well-sealed house on a summer day, he finds that the house is at 32°C. He turns on the air conditioner, which cools the entire house to 20°C in 15 min. If the COP of the air-conditioning system is 2.5, determine the power drawn by the air conditioner. Assume the entire mass within the house is equivalent to 800 kg of air for which cv=0.72 kJ/kg °C and Cp = 1.0 kJ/kg °C.
   3. Define in pure substance by suitable phase change diagram the term (i) Triple Point (ii) Critical Point (iii) Saturation states (iv) Sub cooled state (v) Superheated vapour state.
   4. An insulated rigid tank is divided into two equal parts by a partition. Initially, one part contains 4 kg of an ideal gas at 800 kPa and 50°C, and the other part is evacuated. The partition is now removed, and the gas expands into the entire tank. Determine the final temperature and pressure in the tank.
   5. Write down the first and second TdS equations and derive the expression for the difference in heat capacities, Co and Cv.

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SECTION C

3. Attempt any one part of the following: 7x1=7
   1. A piston-cylinder device initially contains 0.4 m³ of air at 100 kPa and 80°C. The air is now compressed to 0.1 m3 in such a way that the temperature inside the cylinder remains constant. Determine the work done during this process.

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