Q1 (a) By considering a thermodynamic open system of your own choice, briefly explain how the various mechanisms of energy transformation will usually take place in it. [5] (b) Gas inside a piston-cylinder device initially at the pressure of 7 bar and volume of 0.2 m³ expands to generate 128 kJ of work. i. Considering an ideal isothermal gas process, determine the final volume and pressure of the process. [6] ii. If the pressure instead is kept constant, what will be the work done? [2] iii. If the volume instead is kept constant, what will be the work done? [1] iv. Draw all the three processes on a P-V diagram. [4] v. Explain briefly which process leads to better work done and why. [4] vi. Finally, if the change in the internal, kinetic and potential energy in the system is ignored, what is the amount of heat requirement for each of the above three processes? [3]
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### Part (a): Mechanisms of Energy Transformation in an Open Thermodynamic System ** Show more…
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5. In an open system, for maximum work, the process must be entirely a) irreversible b) reversible c) adiabatic d) none of the mentioned 7. Which of the following is true for a closed system? a) mass entering = mass leaving b) mass does not enter or leave the system c) mass entering can be more or less than the mass leaving d) none of the mentioned 13. A piston cylinder contains 0.5 kg of air at 500 kPa and 500 K. The air expands in a process so pressure is linearly decreasing with volume to a final state of 100 kPa and 300 K. Find the work in the process. a) 56.1 kJ b) 66.1 kJ c) 76.1 kJ d) 86.1 kJ
Adi S.
A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes: Process 1-2: Compression with pV = constant, from p1 = 1 bar, V1 = 2 m3 to V2 = 0.2 m3, U2 - U1 = 100 kJ. Process 2-3: Constant volume to p3 = p1. Process 3-1: Constant-pressure and adiabatic process. There are no significant changes in kinetic or potential energy. Determine (a) the net work of the cycle, in kJ, (b) the heat transfer for Process 2-3, in kJ, and (c) Is this a power cycle or a refrigeration cycle? Explain.
Sri K.
$4-35 \quad$ ? $\mathrm{A}$ piston-cylinder device initially contains steam (f) at $200 \mathrm{kPa}, 200^{\circ} \mathrm{C}$, and $0.4 \mathrm{m}^{3}$. At this state, a linear spring $(F \propto x)$ is touching the piston but exerts no force on it. Heat is now slowly transferred to the steam, causing the pressure and the volume to rise to $250 \mathrm{kPa}$ and $0.6 \mathrm{m}^{3}$ respectively. Show the process on a $P$ -v diagram with respect to saturation lines and determine ( $a$ ) the final temperature, (b) the work done by the steam, and ( $c$ ) the total heat transferred.
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