An inert gas held in a plunger undergoes three stages: Stage 1-2: the gas is compressed without any heat transfer where the initial conditions are 11m³ and 2kPa and final conditions 3m3 and 8kPa and PV is a constant Stage 2-3: the gas undergoes expansion where 287kJ is added and v2 returns to 11m3 at constant pressure of 8kPa Stage 3-1: the plunger is stationary as the gas cools and returns to its initial state a) Sketch the cycle above b) Determine the following in kJ (nearest whole number): i) Qcycle

An inert gas held in a plunger undergoes three stages: Stage 1-2: the gas is compressed without any heat transfer where the initial conditions are 11m³ and 2kPa and final conditions 3m3 and 8kPa and PV is a constant Stage 2-3: the gas undergoes expansion where 287kJ is added and v2 returns to 11m3 at constant pressure of 8kPa Stage 3-1: the plunger is stationary as the gas cools and returns to its initial state a) Sketch the cycle above b) Determine the following in kJ (nearest whole number): i) Qcycle

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 steel casting weighing 2 kg has an initial temperature of 500oC; 40 kg of water initiallyat 25oC is contained in a perfectly insulated steel tank weighing 5 kg. The casting isimmersed in the water and the system is allowed to come to equilibrium. What is its finaltemperature? Ignore effects of expansion or contraction, and assume constant specific heatsof 4.18 kJ/kg.oC for water and 0.5 kJ/kg.oC for steel.
The case of a piston-cylinder device provided with stops is presented. Initially, the water supports the weight of the piston, and the force of the atmosphere is 300 kPa and 0.4 m3/kg. The water is heated until it reaches a saturated steam condition and the plunger rests on the stops. With the piston on the stops, the water is heated to a pressure of 700 kPa. Plot the curves of the processes on the p-V and T-V diagrams indicating the initial and final states of the guide. On both the p-V and T-V diagrams plot the isotherms passing through both states, and show their values in °C.
Inside a piston-cylinder device there is 5 kg of a moist water vapor at 125 kPa. At the beginning there are 2 kg of water in the liquid phase, and the rest is in the vapor phase. Then, heat is transferred to the water; the plunger, which rests on a set of stops, begins to rise when the pressure inside reaches 300 kPa. Heat transfer continues until the total volume increases by 20 percent. a) the start and final temperatures b) the mass of liquid water when the plunger starts to rise c) the work done during this process. Also plot the process on a P-v diagram
Sup A 14-ft3 tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is rotated until the pressure inside rises to 20 psia. During the process 20 Btu of heat is lost to the surroundings. Determine the paddle-wheel work done. Neglect the energy stored in the paddle wheel. The gas constant and molar mass of oxygen are R = 0.3353 psia·ft3/lbm·R and M = 32 lbm/lbmol. The specific heat of oxygen at the average temperature of Tavg = (735 + 540)/2 = 638 R is cv ,avg= 0.160 Btu/lbm·R. The paddle-wheel work done is Btu. ANSWER is not 54 or 72
1 kg of steam at initial conditions of 5.1 MPa and 370 °C expands in a turbine until it becomes saturated. It is withdrawn and reheated to 340°C. After further expansion in the turbine to 160 , part of the steam is extracted for feedwater heating. The remaining steam expands to the condenser pressure of 0.018 MPa. For the steam table: https://drive.google.com/drive/folders/1WTb6WwrXs2FR8Y92B3exTPKm6tZtDL8t
A piston-cylinder assembly initially contains 100 kPa of pressure and 2 Liter of air at 25 ° C. Then the air is compressed to 620 kPa pressure and 160 ° C. The useful work done for compression is 1.22 kJ. Assuming that the ambient pressure and temperature are 100 kPave 25 ° C, respectively, a) Calculate the availability of air in the initial and final states, b) the minimum work required for the compression process, c) the second-law efficiency of the process change.
The piston-cylinder assembly, which initially contains 5 kg of water at 20 ° C and 400 kPA pressure, has a dryness level of 0.41 when it comes to the upper stoppers after the heat given at constant pressure. As the saturated steam is obtained after the heat given in constant volume; a)final pressure and temperature. b)Plot the state change on a p-v and t-v diagram. c)work done after the process and heat transfer
A piston-cylinder assembly contains R-134a refrigerant in a volume of 0.15 m3, 0.28 MPa and 40 ° C. Initially the piston is fixed with a pin. The piston-cylinder assembly is heated from a heat source at 150 ° C and the pressure rises to 0.32 MPa. Then the pin is pulled and heat is transferred to an environment at 25 ° C, allowing the R-134a refrigerant to reach 50 ° C at constant pressure. a) Calculate the amount of heat and work transfer in processes. b) Calculate the entropy generation in processes. Comment on the conformity of the processes to the second law of thermodynamics.
One kg of air (R= 0.287kJ/kg K and ɣ=1.4) at an initial pressure and temperature of 0.1MN/m2 and 30o C, respectively. It is compressed adiabatically (PV ˠ = constant) to 10bar and then cooled to its initial temperature under constant pressure. Calculate a) The pressure, volume, and temperature at each point of the cycle.b) The work done during compression process.c) The heat rejected during the cooling process.
A piston system contains a hot fluid at 250kPa pressure that is cooled while being stirred by a paddle wheel. Initially, the internal energy of the fluid is 1500 kJ and volume is 2m3. During the cooling process, the fluid loses 400 kJ of heat, and the paddle wheel does 100 kJ of work on the fluid. At the end, volume reduces to 0.5m3. Pressure remains constant. Determine the final internal energy of the fluid. Neglect the energy stored in the paddle wheel.
Hi! A 14-ft3 tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is rotated until the pressure inside rises to 20 psia. During the process 20 Btu of heat is lost to the surroundings. Determine the paddle-wheel work done. Neglect the energy stored in the paddle wheel. The gas constant and molar mass of oxygen are R = 0.3353 psia·ft3/lbm·R and M = 32 lbm/lbmol. The specific heat of oxygen at the average temperature of Tavg = (735 + 540)/2 = 638 R is cv ,avg= 0.160 Btu/lbm·R. The paddle-wheel work done is Btu. ANSWER
A piston-cylinder device with a set of stops initially contains 0.5 kg of steam at 1.2 MPa and 500°C. The location of the stops corresponds to 30 percent of the initial volume. Now the steam is cooled. Determine the compression work if the final state is;(a) 1.2 MPa and 200°C.(b) 500 kPa(c) Also determine the temperature at the final state in part (b).