Problem 4 (+3 kg of oxygen is sealed in a rigid container at 150°C and 250 kPa. The gas is heated in a constant volume process until itspressure becomes four times the initial pressure. Given the specific gas constant R = 0.259 kJ/kg.K and the specific heat atconstant volume Cv = 0.658 kJ/kg.K. Determine:(a) The change in enthalpy of the gas in KJ.(b) Heat transfer during the process.

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Answered: Problem 4 (+ 3 kg of oxygen is sealed…

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

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II. A 1-m³ tank containing air at 25°C and 500 Kpa (abs) is connected through a valve to another tank containing 5 kg of air at 35°C and 200 Kpa (abs). Now the valve is opened, and the system is allowed to reach thermal equilibrium, which are at 20 °C. Determine the volume of the second tank and the final equilibrium pressure of air.
A 300 L tank contains gas at a pressure of 3.5 MPa, a Temperature of 30 degrees Celcius, and a mass of 12 kg. A part of the gas was discharged and the temperature pressure change to 20 degrees Celcius and 2 MPa, respectively. The heat was applied and the temperature was back to 30 degrees Celcius. a. Determine the value of the gas constant. b. Determine the final mass. c. Determine the final volume. d. Determine the final pressure.
5. The two tanks (Tank A and Tank B) are connected by a valved tube. Initially, the valve is closed. Tank A contains 1 MPa, 1.5 kg of water vapor at 350^ C, and tank B of saturated water at 150 degrees * C and dryness x = 0.5 . contains 3 kg The valve was opened and the water vapor moved and finally the pressure in the two tanks was equal to 300 kPa. Answer the following questions. (1) Calculate the volumes of tank A and tank B, respectively. (2) Calculate the final temperature and dryness (in case of saturation). (3) Find the amount of heat transfer during this process.
2. A sealed rigid vessel has volume of 1 m³ and contains 2 kg of water at 100°C. The vessel is now heated. If a safety pressure valve is installed, at what pressure should the valve be set to have a maximum temperature of 200°C?
1. A frictionless piston-cylinder device with cross-section area of 0.01 m² contains 0.5 m3 gaseous ammonia initially at 200 kPa and 135 °C. Now the gas is isothermally compressed until the pressure increases to 800 psig. The surrounding pressure is 100 kPa and the gravitational force is 9.8 m/s? a. What is the mass of the gas in kg b. What is the mass of the piston in kg c. Calculate the volume in m³ of the compressed gas
7) Determine the temperature of water at a state of P= 0.5 MPa and h = 2890 kJ/kg
4. A vessel of volume 0.2 m3 contains Nitrogen at 1,013 KPa and 15° C. If 0.2 kg Nitrogen is now pumped into the vessel, calculate the new pressure when the vessel has returned to its initial temperature.
A rigid tank contains 2.0 kg of nitrogen at 100 K and ? = 0.50. Then, 0.5 kg ofnitrogen is removed from the tank through a valve. If the temperature remains constant throughout the process, determine the final state of the nitrogen inside the tank and the volume of nitrogen removed if the valve is located at(a) The top(b) The bottom
6. Two kilograms of water is contained in a piston-cylinder loaded with a linear spring and the outside atmosphere. Initial the water is at 200 kPa, and V = 0.2 m³. Heat is now added until the volume grows to 0.8 m³, and the temperature increases to 600°C. Determine the following: (a) Initial phase of the system (calculate quality if appropriate). (b) Find the final pressure of the system. Show how you determine the final state and which table to look for the pressure. (c) Show the process on a P-v diagram and explain why the process is linear.
B- A 1.8 m rigid tank contains a refrigerant-134a at 50°C. One-third of the volume is in the liquid phase and the rest is in the vapor form. Determine (a) the pressure of the refrigerant-134a, (b) the quality of the saturated mixture, and (c) the density of the mixture. Use the table below: Temp. 'C Sat. Press. kPa 1253.6 v Sat. Liquid m'/kg V Sat. Vapour m /kg 0.015939 0.014265 48 0.0008996 52 1386.2 0.0009150
Two tanks containing air with the given volume, mass, temperature and pressure shown in Figure Q2 are connected with the valve. Now the valve is opened and the air in the two tanks are allowed to mix and reach to equilibrium condition with the surrounding temperature of 20°C. Considering the necessary assumption determine, (a) the volume of tank B, (b) determine the pressure of both tanks after the valve is opened. (c) Can we use ideal gas low for saturated water steam at atmospheric pressure? Discuss the reason.
4. A rigid tank initially contains 5kg of saturated vapor steam at 150°C. Heat transfer is done until the pressure of steam reaches 1.20 MPa. Sketch the P-v diagram. Solve for the change in enthalpy and heat transferred.

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