Air is compressed in a cylinder during a non-flow reversible polytropic process from an initial temperature and pressure of 60°F and 12psia to a final temperature and pressure of 295°F and 80psia. If the cylinder contains 0.04 lbm of air, find:  a. The value of polytropic exponent (n) b. The work done, in BTU c. The change in enthalpy, in BTU d. The heat transferred, BTU

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Q: Q₁) A piston cylinder device contains helium gas initially at 150 Kpa, 20 °C and 0.5 m³. The helium…

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Q: Air (MW=29 kg/kmol) at 115.00 kPa and 285.00 K is compressed steadily to 600.0 kPaThe mass flow rate…

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Q: If 6 liters of air at a pressure of 100 kPaa and 25 0 C are compressed reversibly according to PV 2…

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Q: A piston-cylinder assembly contains 3 lb of water vapor, initially at 300F and 20 lbf/in2 is…

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Q: the first case, there is 5 kg of water at 300 kPa (3 bar) pressure and 60% dryness in a closed…

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Q: Q2. A 0.8 m³ rigid tank contain carbon dioxide (CO₂) gas at 250K and 100 kPa. A 500W electric…

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Q: a tank of volume 1m3 initially contains steam at 60 bar 320 degrees celsius . stream is stream…

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Q: Q.) A piston-cylinder device contains air at initially 1000 kPa and 200°C. The air is first expanded…

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Q: Air, 5.37 kg, is compressed in a piston‑cylinder device from 91.3 kPa and 65.3 ∘C to 195.2 kPa in an…

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Q: An insulated piston-cylinder device contains 0.2 m³ of saturated refrigerant R-134a vapor at 1 MPa…

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Q: At P = 1.8 and h = 3040 Kj/kg. Determine the Temperature, Internal Energy, Volume with the use of…

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Q: a) A freely-moving piston-cylinder device contains 0.4 m³ or air at 300 kPa and 57 °C at its initial…

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Q: 6. An ideal gas with Cv = 1.62 kJ/kg-K and R = 273J/kg-K expands from 0.15m3 (cubic meter) and 27…

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Q: 422. There are 1.36 kg of air at 137.9 kPaa stirred with internal paddles in an insulated rigid…

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Q: Find the enthalpy of steam at 0.40 MPa with specific volume of 0.41 cubic m per kg

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.