1kg of air can expand reversibly in 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 overall change entropy take CP=1.005 KJ/Kg.k, R=0.287 KJ/Kg.k.

1kg of air can expand reversibly in 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 overall change entropy take CP=1.005 KJ/Kg.k, R=0.287 KJ/Kg.k.

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

Similar questions

A rigid insulated chamber of volume 2 m3 is divided into 2 equal parts by diaphram.One half of chamber is filled with air (R=0.287 KJ/kg.K) at 300 K and 200 kPa while the other half is completely evacuated.The diaphram is ruptured and the cylinder is allowed to reach equilibrium.Calculate the entropy change in Kj/K during this process.
Consider a system consisting of a hot body at 70°C and a cold body at 20°C. If 100 kJ of heat is transferred from the hot to the cold body, calculate a) The entropy loss from the hot body and the entropy increase in the cold body. b) How much did the entropy of the universe increase during this transfer? (Assume the bodies are sufficiently large that the temperatures do not change significantly during this process.)
A 30-kg aluminum block (specific heat = 0.973 kJ/kg K) initially at 135°C is brought into contact with a 35-kg block of iron (specific heat = 0.45 kJ/kg-K) at 65°C in an insulated enclosure. Compute for the final total entropy change for this process in kJ/K.
Saturated Steam at 0.16 Mpa is compressed in an irreversible adiabatic process with an efficiency of 80.24. For a final pressure of 0.45 Mpa, determine the initial specific entropy and final specific entropy in kj/kg-K
As a result Of heat transfer to the surroundings durİng a constant-pressure process, 0.375 kg Of steam İna frictionless piston-cylinder assembly experiences a decrease in entropy of 2.75 kJ[kgK. The initialtemperature and pressure Of the steam are 700 oc and 1.6 MPa, respectively, and the process İsinternally reversible. Calculate the work and the heat transfer for this process and the total entropy change
In a system, 2.5 kg of air at 350 0C expands isothermally behind a piston in a cylinder until the volume has doubled. The air is then compressed at constant pressure until the original volume has been reached. Take the specific heat at constant pressure and volume as 1.006 and 1.717 kJ/kg K, respectively. calculate the isothermal change of entropy and calculate the isobaric change of entropy and the value of change of entropy to 2 decimal place.
Two insulated Tanks are connected with an insulated pipe and a valve. The valve is open and steam flows from Tank A to tank B in a quasi static proccess until the valve is closed. The specific entropy in each tank is maintained the same, but the total entropy in the system is changed , explain why .
A quantity of an ideal gas in an isolated system expanded isothermally and reversibly at 400 K from a volume V1 to a volume V2. During the expansion, the gas absorbs 200 J of heat from the reservoir in contact with it. Calculate (a) the entropy change of the gas; (b) the entropy change of the reservoir, and (c) the entropy change of the whole system.Answer: a. 0.50b. -0.50 c. 0
An iron horseshoe of mass 1.47 kg is takenfrom a furnace at 660 ◦C and dropped into1.83 kg of water at 8.5◦C.If no heat is lost to the surroundings, determine the total entropy change. The specificheat of water is 4186 J/K · kg and of iron448 J/K · kg.Answer in units of J/K.
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
Ammonia with MW=17, weighing 22kg is confirmed inside a cylinder equipped with a piston has initial pressure of 413kPa and 48C. if 2900kJ of heat is added until the final pressure is 413kPa and final temperature is 100C. Determine the change in entropy kJ/K
Heat in the amount of 95kJ is transferred directly from a hot reservoir at 871 °C to a cold reservoir at 440 °C. Calculate the entropy change of the hot reservoir (in kJ/K).