Thermodynamics-1.pdf

# 10 define standard heats of combustion 11 define

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10. Define: Standard heats of combustion. 11. Define: Standard heats of reaction. 12. Define: Entropy. 13. Define: Heat Pump. 14. What is Refrigeration? Q.2: Give various statements of the second law of thermodynamics. Q 3: Drive the equation for enthalpy and Entropy as functions of temperature and pressure. Q.4: Prove that Cp-Cv = R Q 5: A refrigeration process operating at a condenser temperature at 290K needs 1 kW of power per ton of refrigeration. i) What is the coefficient of performance? ii) How much heat is rejected in the condenser? iii) What is the lowest temperature the system can possibly maintain? Q.6: Define the first law of thermodynamics in its various forms. What are its limitations?

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Q 7: For steady flow in a heat exchanger at approximately atmospheric pressure, what is the amount of heat required when 10 moles of SO2 is heated from 200oC to1100oC? Heat capacity of SO2 is given by: Cpig/R = 5.699 + 0.801 x 10 -3T 1.015 x 105T -2 J/ (mol. K), T is in K Q 8: A system consisting of some fluid is stirred in a tank. The rate of work done on the system by the stirrer is 2.25 hp. The heat generated due to stirring is dissipated to the surroundings. If the heat transferred to the surroundings is 3400 kJ/h, determine the change in internal energy. Q.9: Derive Carnot equations for a Carnot cycle using an ideal gas. Q 10: Show that COP of a heat pump is greater than COP of a refrigerator by unity. Q 11: A diesel cycle operates at a pressure of 1 bar at the beginning of compression and the compression ratio is 16. Heat is supplied until the volume is twice the clearance volume. If = 1.4, find the mean effective pressure. Q 12:An engine operates in an Otto cycle between the temperature limits of 1500 K and 300 K. Calculate the maximum power developed by the engine, assuming its intake air rate of 0.45 kg/min. Q 13: Dry saturated stem is throttled from 25 bar to a pressure of 5 bar and is then allowed to expand adiabatically to 1 bar. Use the Mollier diagram to find the (a) dryness fraction of the stem in the final state. (b) temperature of the stem in the final state.(c) total enthalpy change. Q 14:A steam sample at 2 MPa has a specific volume of 0.93 m3/kg. Determine the dryness fraction of the stem. Also, calculate the specific enthalpy and specific entropy of the sample. Q 15: Define pure substance, critical point and triple points Q 16: Derive the Maxwell relations Q 17: Discuss the following power cycle: Rankine cycle, otto cycle, brayton cycle.

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