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ME1209 THER ENG

# ME1209 THER ENG - ME 1209 THERMAL ENGINEERING KINGS COLLEGE...

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ME 1209 – THERMAL ENGINEERING KINGS COLLEGE OF ENGINEERING,PUNALKULAM KINGS COLLEGE OF ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING QUESTION BANK SUBJECT CODE & NAME : ME 1209 – THERMAL ENGINEERING YEAR / SEM : II / III UNIT – I THERMODYNAMICS PART – A 01. What is thermodynamic system? (2) 02. Define surrounding and universe. (2) 03. What is an isolated system? (2) 04. Distinguish between intensive properties and extensive properties. (2) 05. Differentiate between Heat and Work. (2) 06. Indicate the relation between the specific heats Cp and Cv. (2) 07. What is internal energy? (2) 08. What is enthalpy? (2) 09. State the Zeroth law of thermodynamics. (2) 10. State the First law of thermodynamics. (2) 11. State the second law of thermodynamics – Kelvin Plank statement. (2) 12. State the second law of thermodynamics – Rudolf Clausius statement (2) 13. What is defined as the Perpetual motion machine of first kind? (2) 14. What is defined as the Perpetual motion machine of second kind? (2) 15. Differentiate between Heat pump and Refrigerator. (2) 16. What is meant by entropy of a gas? (2) 17. Define Clausius inequality. (2)

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ME 1209 – THERMAL ENGINEERING KINGS COLLEGE OF ENGINEERING,PUNALKULAM PART – B 1. The following data refer to a closed system, which undergoes a thermodynamic cycle consisting of four processes. (16) Process Heat transfer kJ/min Work transfer kJ/min a - b 50,000 ----- b – c -5,000 34,200 c – d -16,000 -2,200 d – a ---- -3,000 Show that the data is consistent with the first law of Thermodynamics and calculate: a) Net rate of Work output in MW, b) Efficiency of the cycle 2. 15kg of air in a piston cylinder device is heated from 25°C to 90°C by passing current through a resistance heater inside the cylinder. The pressure inside the cylinder is held constant at 300kPa during the process and a heat loss of 60kJ occurs. Determine the electrical energy supplied in kW-hr and change in internal energy. (16) 3. A certain gas of volume 0.4m 3 , pressure 4.5 bar and temperature of 130°C is heated in a cylinder to 9 bar when the volume remains constant. Calculate a) temperature at the end of the process, b) the heat transfer, c) Change in internal energy, d) Work done by the gas, e) Change in enthalpy, e) mass of the gas. Assume Cp = 1.005kJ/kgK and Cv = 0.71 kJ/kgK. (16) 4. i) What is a thermodynamic system? Explain the classification of thermodynamic system with suitable examples. (8) ii) Establish the inequality of Clausius. (8) 5. A gas of mass 0.35 kg pressure 1535 kN/m² and temperature of 335°C is expanded adiabatically to a pressure of 126 kN/m². The gas is then heated at constant volume until it reaches 335°C, when its pressure is found to be 275kN/m². Finally the gas is compressed isothermally until its original pressure of 1535kN/m² obtained. Draw the p-V diagram and find out the following a) the value of adiabatic index b) change in internal energy during the adiabatic process, and c) heat transfer during constant volume process.
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