0.44 kg of air at 180°C expands adiabatically to three times its original volume and during the process, there is a fall in temperature to 15°C. The work done during the process is 52.5 kJ. Calculate cp and cv. 0.44 kg of air at 180°C expands adiabatically to three times its original volume and during …
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Air at 1.02 bar, 22°C, initially occupying a cylinder volume of 0.015 m3, is compressed reversibly and adiabatically by a piston to a pressure of 6.11 bar. Calculate : (i) The final temperature ; (ii) The final volume ; (iii) The work done. Air at 1.02 bar, 22°C, initially occupying a cylinder volume of 0.015 …
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A cylinder contain 0.45 m3 of a gas at 1 x 105 N/m2 and 80°C. The gas is compressed to a volume of 0.13 m3, the final pressure being 5 x 105 N/m2. Determine : (i) The mass of gas ; (ii) The value of index ‘n’ for compression ; (iii) The increase in internal …
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A housewife, on a warm summer day, decides to beat the heat by closing the window and door in the kitchen and opening the refrigerator door. At first she feels cool and refreshed, but after a while the effect begin to wear off. Evaluate the situation as it relates to First Law of Thermodynamics, considering …
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A 15 cm diameter vertical cylinder, closed by a piston contains a combustible mixture at a temperature of 30°C. The piston is free to move and its weight is such that the mixture pressure is 3 bar. Upper surface of the piston is exposed to the atmosphere. The mixture is ignited. As the reaction proceeds, …
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The following is the equation which connects u, p and v for several gases u = a + bpv where a and b are constant. Prove that for a reversible adiabatic process, pvγ = constant, where γ = (b + 1)/b. The following is the equation which connects u, p and v for several gases …
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0.2 m3 of air at 4 bar and 130°C is contained in a system. A reversible adiabatic expansion lakes place till the pressure falls to 1.02 bar. The gas is then heated at constant pressure till enthalpy increases by 72.5 kJ. Calculate : (i) The work done ; (ii) The index of expansion, if the …
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A movable frictionless piston closes a fully insulated cylinder on one side and offers a constant resistance during its moti0n. A paddle work is drawn into the cylinder and does work on the system. Prove that the paddle work is equal to change in enthalpy. A movable frictionless piston closes a fully insulated cylinder on …
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90 kJ of heat are supplied to a system at a constant volume. The system rejects 95 kJ of heat at constant pressure and 18 kJ of work is done on it. The system is brought to original state by adiabatic process. Determine : (i) The adiabatic work ; (ii) The values of internal energy …
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A fluid is contained in a cylinder by a spring-loaded, frictionless piston so that the pressure in the fluid is a linear function of the volume (p = a + bV), The internal energy of the fluid is given by the following equation U = 42 + 3.6pV where U is in kJ, p in …
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