1.3 1 kg of air has a volume of 85 litres and a temperature of 150ºC. The air is heated at  constant volume until the temperature is 250ºC. It is then expanded according to the law Pv1.3 =  C until the pressure has halved. R for air is 0.287 kJ/kg.K and Cp = 1.005 kJ/kg.K. (a) Calculate the change in entropy during the constant volume heating process (b) Calculate the pressure at the beginning and end of constant volume process, the  temperature and pressure at the end of expansion and the volume at the end of expansion. (c) Calculate the change in entropy during the expansion

Q: 1 kg of air is compressed according to the law PV1.25 = C from 1.03 bar and 15°C to 16.45 bar.…

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Q: 4. Nitrogen with a mass of 0.3 Ibm undergoes a process from P1 = 20 psi, T1 = 500°R to P2 = 150 psi.…

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Q: One-quarter Ibmol of oxygen gas (O₂) undergoes a process from p₁ = 20 lb/in², T₁ = 500°R to p2 = 150…

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Q: 5 kg air with initial temperature of 100°C expands at a constant pressure of 2 bar to reach to a…

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Q: Determine T2, in oR, and the change in entropy, in Btu/oR.

A: Given: n = 1/4 (quarter lb-mol) P1 = 20 lbf/in2 T1 = 500 oR W = -500 BTU Q = -240 BTU It is required…

Q: Two vessels A and B of different sizes are connected by a pipe with a valve. Vessel A contains 140 L…

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Q: Water contained in a closed, rigid tank, initially at 100 lb;/in², 800°F, is cooled to a final state…

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Q: = 71°C with v₁ = 0.201 m³/kg. The gas v1 A piston-cylinder assembly holds 1.2 kg of air initially at…

A: First, we need to convert the temperatures from Celsius to Kelvin because the entropy change…

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

A: Now here the given data as below: Tank volume v = 1 m3 Initial Pressure P1 = 60 bar Initial…

Q: find the changes in h  as appropriate. The initial state pressure is p1 = 0.5 MPa. the final state…

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Q: A tank of compressed air is at 40°C and 10 atm. 1 third of the gas is removed for inflating a car…

A: Dear student,                    According to the guidelines I am allowed to answer only three…

Q: One-quarter Ibmol of oxygen gas (O2) undergoes a process from p1 = 20 lbf/in?, T1 = 500°R to p2 =…

A: Givenp1=20lbf/in2T1=500°Rp2=150lbf/in2W=-500BtuQ=-127.5BtuNo. of moles of oxygen gas…

Q: 1.56 moles of an ideal gas is placed in a piston and is subjected to the following changes. (a) The…

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Q: Calculate the compressor work in kJ required to compress 1 kg of an ideal gas from an initial volume…

A: Given:mass, m = 1 kgV1= 0.65m3P1= 101.3 kPaP2= 517 kPan=1.35This question aims to determine…

Q: An electric current of 10A flows for one minute through a 202 resistor which is maintained at 10°C…

A: Since resistor operate in steady state, and for steady state operations the change in property of…

Q: What will be change in entropy of the system if a piston-cylinder arrangement contains 0.06 m³ of…

A: Data given -  V1 = 0.06 m3  P1 = 1 bar  T1 = 295 K  Isothermally  P2 = 6 bar

Q: One kilogram of water contained in a piston-cylinder assembly, initially at 160°C, 150 kPa,…

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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.