4.6 1 kg of steam undergoes a reversible isothermal process from 20 bar and 250°C to apressure of 30 bar. Calculate the heat flow, stating whether it is supplied or rejected,and sketch the process on a T-s diagram.(-135 kJ/kg)4.7 1 kg of air is allowed to expand reversibly in a cylinder behind a piston in such a waythat the temperature remains constant at 260°C while the volume is doubled. The pistonis then moved in, and heat is rejected by the air reversibly at constant pressure untilthe volume is the same as it was initially. Calculate the net heat flow and the overallchange of entropy. Sketch the process on a T-s diagram.(-161.9 kJ/kg; -0.497 kJ/kg K)4.8 Steam at 5 bar, 25 °C, expands isentropically to a pressure of 0.7 bar. Calculate the finalcondition of the steam.(0.967)4.9 Steam expands reversibly in a cylinder behind a piston from 6 bar dry saturated, to apressure of 0.65 bar. Assuming that the cylinder is perfectly thermally insulated, calculatethe work done during the expansion per kilogram of steam. Sketch the process on aT-s diagram.(323.8 kJ/kg)4.10 1 kg of a fluid at 30 bar, 300 C, expands reversibly and isothermally to a pressure of0.75 bar. Calculate the heat flow and the work done (i) when the fluid is air, (ii) whenthe fluid is steam. Sketch each process on a T-s diagram.(607 kJ/kg; - 607 kJ/kg; 1035 kJ/kg; - 975 kJ/kg)4.12 1 kg of air at 1.013 bar, 17 C, is compressed according to a law pu constant, untilthe pressure is 5 bar. Calculate the change of entropy and sketch the process on a T-sdiagram, indicating the area which represents the heat flow.(-0.0885 kJ/kg)4.13 0.06 m' of ethane (molar mass 30 kg/kmol), at 6.9 bar and 260°C, is allowed to expandisentropically in a cylinder behind a piston to a pressure of 1.05 bar and a temperatureof 107°C. Calculate 7, R, e,, c., for ethane, and calcuiate the work done during theexpansion. Assume ethane to be a perfect gas.The same mass of ethane at 1.05 bar, 107 C, is compressed to 6.9 bar according toa law pu1. = constant. Calculate the final temperature of the ethane and the heat flowto or from the cylinder walls during the compression. Calculate also the change ofentropy during the compression, and sketch both processes on a p-t and a T-s diagram.(1.219; 0.277 kJ/kg K; 1.542 kJ/kg K; 1.265 kJ/kg K; 54.2 kJ; 377.7°C; 43.4 kJ;0.0862 kJ/K)

We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

4.6 1 kg of steam undergoes a reversible isothermal process from 20 bar and 250°C to a pressure of 30 bar. Calculate the heat flow, stating whether it is supplied or rejected, and sketch the process on a T-s diagram.

4.6 1 kg of steam undergoes a reversible isothermal process from 20 bar and 250°C to a pressure of 30 bar. Calculate the heat flow, stating whether it is supplied or rejected, and sketch the process on a T-s diagram.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: how much work is done when 10m^3 of an air is initially at a pressure of 1 atm and a temperature of…

A: Given Data V=10 m3 P1= 1 atm P2= 6 atm Rigid container

Q: QA piston/cylinder arrangement, contains CO2 at 300 kPa, 250°C. The 40-kg piston has a diameter of…

Q: 1. A 9.45 g sample of He had a volume of 25.2 dm³ at 325 K. Calculate the work done when the sample…

A: Given:The mass of the sample of He, The initial volume of the sample, The temperature of the sample,…

Q: Can you show the step-by-step solution how to get the answers for this problem? There are 2.27…

Q: b) Air is compressed in a steady flow compressor operating at a pressure ratio of 8. The conditions…

Q: A polytropic process of air from 150 psia, 300°F, and 1 ft occurs to P, = 20 psia in accordance with…

Q: Steam at 2000 kPa and 250 C is expanded isentropically to 343.0 kPa and it is then further expanded…

Q: A cylinder given contains 6 m^3 of an ideal gas at a pressure 1 bar .The gas is compressed in a…

A: Given:volume of gas=6 m3Pressure=1 barfinal pressure=5 barFind,Work=?

Q: opened and argon flows into B and eventually reaches a uniform state of 150 kPa, 30°C throughout.…

Q: Find the total heat in kJ required for ice at -15°C to become vapor at 120°C.

A: As per the guidelines we will answer the first question for you, for the second question kindly…

Q: Problem 2. Entropy Balance Using Table of Properties A piston-cylinder assembly contains 3 kg of…

Q: Saturated steam at 329.3 degree Celsius undergoes an isentropic process until it reaches a pressure…

A: Given Data The temperature of the steam is T=329.3°C=602.3 K. The pressure of the steam is P=1.6…

Q: A gas turbine uses 4Kg/s of hot air. It take it in a 4 bar and 760C and exhausts it at 400C. The…

Q: Air of 9.9947 lb is initaily at 100 psi and 500°F. The air undergoes a reversible adiabatc process…

A: Solution is attached below:

Q: As shown in the figure, a 320-ft° tank contains 25 Ib of H2O initially at 30 Ibf/in?. The tank is…

Q: D. Discuss why the assumption of negligible piston acceleration was made. E. Which of the work…

Q: 9.3 1800 kJ of heat is transferred to 1m² of air at 14 bar and 200 °C. Find (a) the final…

Q: (a) Steam at 20 bar and 375 °C expands reversibly in a perfectly thermally insulated cylinder behind…

A: Draw the PV and Ts diagram of the process.

Q: Initially, at 150 °C, 350 kPa, there is 1 kg of steam in a fixed volume vessel. Up to 645 kJ of heat…

A: Given: Initial temperature of the steam→Ti=150°C=423.15K Initial pressure of the steam→Pi=350 KPa…

Q: Q/Fluid at 15 bar is contained in a cylinder behind a piston, the initial volume being 0.01 m3.…

Q: Saturated liquid water, initially at 25°C contained inside a tank, is then delivered by a pump at 5…

Q: 3.11 A piston/cylinder arrangement, shown in Fig. P3.11, contains air at 250 kPa, 300°C. The 50-kg…

A: INTRODUCTION: In this problem, we will determine the temperature at which the piston begins to move…

Q: 2.A piston cylinder arrangement contains steam at 10MPaa saturated liquid. Heat was transferred…

A: PHigher =10 Mpa or 100 bar Plower=2 Mpa or 20 bar Now with the help of steam table we need to…

Q: Q4. 0.3 m³ of air at a pressure of 3 bar is expanded to a volume of 0.708 m³and temperature 160°C.…

Q: 4. Steam flows through a turbine. The inlet conditions are 4 MPa and 500°C. The exit conditions are…

Q: Q1: An air receiver contains air at 16 bar and 42°C. A valve is opened and some air is allowed to…

A: Given: The temperature of air initially, T1 = 42 C The pressure of air initially, P1 = 16 bar The…

Q: Water at 40 ° C is converted into superheated steam at 170 ° C at 150 kPa. Specify: a. Initial…

A: Given Data, T1 = Initial temperature of water(i.e., saturated line point) = 40°C T2 = Final…

Q: A polytropic process of air from 150 psia, 300°F, and = 20 psia in accordance with Py1.3 C.…

Q: (QA2) Air is fed to a perfectly insulated turbine at 6 bar and exits the turbine at 1 bar and 300 K.…

Q: 3. For an ideal gas undergoing a reversible process in a closed system, prove that: a) dQ = CpdT -…

A: working substance ideal gasto findto prove : (a) dQ=CpdT-VdP(b) isothermal process expression for Q

Q: At 120 °C, at 60 kPa pressure and 0.2 volume of air, a constant volume of air is heated…

Concept explainers

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.

Question

4.6 1 kg of steam undergoes a reversible isothermal process from 20 bar and 250°C to a
pressure of 30 bar. Calculate the heat flow, stating whether it is supplied or rejected,
and sketch the process on a T-s diagram.
(-135 kJ/kg)
4.7 1 kg of air is allowed to expand reversibly in a cylinder behind a piston in such a way
that the temperature remains constant at 260°C while the volume is doubled. The piston
is then moved in, and heat is rejected by the air reversibly at constant pressure until
the volume is the same as it was initially. Calculate the net heat flow and the overall
change of entropy. Sketch the process on a T-s diagram.
(-161.9 kJ/kg; -0.497 kJ/kg K)
4.8 Steam at 5 bar, 25 °C, expands isentropically to a pressure of 0.7 bar. Calculate the final
condition of the steam.
(0.967)
4.9 Steam expands reversibly in a cylinder behind a piston from 6 bar dry saturated, to a
pressure of 0.65 bar. Assuming that the cylinder is perfectly thermally insulated, calculate
the work done during the expansion per kilogram of steam. Sketch the process on a
T-s diagram.
(323.8 kJ/kg)
4.10 1 kg of a fluid at 30 bar, 300 C, expands reversibly and isothermally to a pressure of
0.75 bar. Calculate the heat flow and the work done (i) when the fluid is air, (ii) when
the fluid is steam. Sketch each process on a T-s diagram.
(607 kJ/kg; - 607 kJ/kg; 1035 kJ/kg; - 975 kJ/kg)
4.12 1 kg of air at 1.013 bar, 17 C, is compressed according to a law pu constant, until
the pressure is 5 bar. Calculate the change of entropy and sketch the process on a T-s
diagram, indicating the area which represents the heat flow.
(-0.0885 kJ/kg)
4.13 0.06 m' of ethane (molar mass 30 kg/kmol), at 6.9 bar and 260°C, is allowed to expand
isentropically in a cylinder behind a piston to a pressure of 1.05 bar and a temperature
of 107°C. Calculate 7, R, e,, c., for ethane, and calcuiate the work done during the
expansion. Assume ethane to be a perfect gas.
The same mass of ethane at 1.05 bar, 107 C, is compressed to 6.9 bar according to
a law pu1. = constant. Calculate the final temperature of the ethane and the heat flow
to or from the cylinder walls during the compression. Calculate also the change of
entropy during the compression, and sketch both processes on a p-t and a T-s diagram.
(1.219; 0.277 kJ/kg K; 1.542 kJ/kg K; 1.265 kJ/kg K; 54.2 kJ; 377.7°C; 43.4 kJ;
0.0862 kJ/K)

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Step by step

Solved in 3 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Calculate the amount of work necessary for the reversible compression of steam from 1 bar to 10 bar. The compression is to take place in a cylinder fitted with a weightless piston at the constant temperature of 500 oC. Under these conditions we have a superheated vapor. Assume that steam may be treated as an ideal gas. Report your answer in units of kJ/kg using three decimal places. For conversion, note that the molar mass of water is 18.015 g/mol.
(a) Steam at 20 bar and 375 °C expands reversibly in a perfectly thermally insulated cylinder behind a piston until the pressure is 0.35 bar. Sketch the p-v and T-s diagrams for the process and calculate the work done per kilogram of steam for this process.(b) If the process in 3 (a) takes place in a steam turbine which is also perfectly thermally insulated, calculate the work done per kilogram of steam and the mass flow rate of steam for the turbine to develop a power output of 1600 kW. (c) How will the results for Part (a) and Part (b) compare with that for actual processes, explain the reason for any difference and the effect on the steam mass flow rate to produce the same power output in Part (b) for the actual process.
0.05 m3 of perfect gas at 6.3 bar undergoes a reversible isothermal processto a pressure of 1.05 bar, Calculate the heat flow to or from the system. (56.4kJ)
I need the answer as soon as possible
Q1: An air receiver contains air at 16 bar and 42°C. A valve is opened and some air is allowed to blow out to atmosphere. The pressure of the air in the receiver drops rapidly to 12 bar when the valve is then closed. Assuming that the mass in the receiver undergoes a reversible adiabatic process, calculate the initial and final mass of air if you know that the amount of air which has left the receiver is 18.04 kgs.
Q1/ Find the equation for the work of a reversible, isothermal compression of 1 mol of gas in a pistonlcylinder assembly if the molar volume of the gas is given by RT y = +b P
Q.2 What will be change in entropy of the system if a piston-cylinder arrangement contains 0.06 m° of Nitrogen at 1bar and 295K is compressed isothermally until the pressure of the gas becomes 6 bar. A -0.0361 kJ/K B -0.0141 kJ/K C -0.530 kJ/K D -0.0260 kJ/K
1. Combustion gases enter the nozzle of a jet engine at 3.8 bar and 820°C. The nozzle is well insulated and the gases expand down to an exit pressure of 1.1 bar. Determine the temperature and the velocity of the gases at exit from the nozzle assuming the velocity at inlet is negligible. For the combustion gases take c, = 1.15 KJ/Kg. K and the ratio of specific heats = 1.32
Q15: Oxygen (molecular weight 32) is compressed reversibly and polytropically in a cylinder from 1.05 bar, 15°C to 4.2 bar in such a way that one-third of the work input is rejected as heat to the cylinder walls. Calculate the final temperature of the oxygen. Assume oxygen to be a perfect gas and take mathcal C V=0.649 kJ/kg K K.
20 kg of water substance at 10 bar and 500 K is contained in a piston-cylinder apparatus. The system does work and the pressure fall to 1 bar, heat being transferred from a reservoir at 600 K. It is stated that when 3400 kJ of work is done by the apparatus, the final internal energy of the water sustance is 40000 kJ. (a) What is the entropy change (kJ/K) of the water substance? (b) How much heat (kJ) is transferred?
I need answer within 20 minutes please please with my best wishes
Oxygen (molar mass 32 kg/kmol ) expands reversibly in a cylinder behind a piston at a constant pressure of 3 bar. The volume initially is 0.0109 m3 and finally is 0.0348 m3; the initial temperature is 16.55 0C. Calculate the absolute temperature after expansion with the correct unit. Assume oxygen to be a perfect gas and take the specific heat at constant pressure as = 0 . 9 1 7 k J / k g K.