4. A pressure cooker operates by cooking food at a higher pressure and temperature than is possibleat atmospheric condition. Steam is contained in the sealed pot, with a small vent hole in themiddle of the cover, allowing steam to escape. The pressure is regulated by covering the vent holewith a small weight, which is displaced slightly by the escaping steam. Atmospheric pressure is29THERMODYNAMICS 1MODULE 1FUNDAMENTAL CONCEPTS100 Kpa, the vent hole area is 7mm2, and the pressure inside is 250 Kpa. What is the mass of theweight?

Answered: Image /qna-images/answer/292e73c1-a7a1-4b97-b543-73a8f037fb13.jpg

Answered: A pressure cooker operates by cooking…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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A pressure cooker operates by cooking food at a higher pressure and temperature than is possible at atmospheric conditions. Steam is contained in the sealed pot, with a small vent hole in the middle of the cover, allowing steam to escape. The pressure is regulated by covering the vent hole with a small weight, which is displaced slightly by the escaping steam. Atmospheric pressure is 1 bar, the vent hole area is 7mm2, and the pressure inside should be 2.75 bar. What is the mass in kg of the small weight?
In the piston-cylinder system shown in the figure, in the first state, the piston is located on the stoppers and the volume below it is 0.15 m3. There is 2 kg of water at a temperature of 40 oC in the cylinder. The cross-sectional area of the piston is 0.075 m2 and its mass is 35 kg. Atmospheric pressure is 100 kPa and gravitational acceleration is 9.76 m/s2. Then, heat is given to the water until it becomes dry saturated water vapor. Calculate the temperature of the water when the piston starts to move over the stoppers and the work done during the whole process.
Helium is used in the Carnot engine where the volumes beginning with constant temperature heat addition are V1= 0.3565 m3; V2= 0.5130 m3; V3= 8.0 m3; V4= 5.57 m3. Determine the thermal efficiency. Use 1.66 as the specific ratio of helium.
(i) A can of soft drink at room temperature is put into the refrigerator so that it will cool. Would you model the can of soft drink as a closed system or as an open system? (ii) A candle is burning in a well-insulated room. Taking the room (the air plus the candle) as the system, determine if there is any heat transfer during the burning process. Explain how?
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.
DESCRIBE THE ENERGY ANALYSIS OF STEADY-FLOW SYSTEMS
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.
A Car with a relief valve-equipped tires start its travel near equatorial sea level at 301.325 kPaa and 23.3 C. After a long drive to a place where the atmospheric pressure is 5% lower, the temperature of the air reached 83 C. If the relief valve actuates at 240 kPag, determine the (a) mass of air released by the valve for each tire.; (b) tire pressure when the tire is cooled back to 23 C. Assume each tire has 0.11 kg of air
During processing in a steel mill, a 375kg steel casting at 800 degrees is quenched by plunging it into a 500-gal oil bath, which is initially 75 degrees . After the casting cools and the oil bath warms , what is the final tempertature of the two? The weight per unit volume of the oil is 7.5 lb/gal.
Air is contained in a piston cylinder arrangement shown in the figure. Initially the air is200 kPa and 20 oC while the piston rests on the lower stops. The air is heated, and thepiston starts to rise freely when the pressure reaches 250 kPa until the piston start toencounter a linear spring when the volume is doubled. Heat is further added until the airtemperature reaches 1000 oC when the volume is triple the initial volume. Considering airas ideal gas:a- What is the final pressure?b- Find the specific work done during the whole process.c- Draw the process on a p-v diagram indicating the properties at all states
Solve the problem. A reciprocating compressor draws in 500 cubic feet per minute of air whose density is 0.079 lb/cu ft and discharges it with a density of 0.304 lb/cu ft. At the suction, pressure is 15 psia, at discharge pressure is 80 psia. The increase in the specific internal energy is 33.8 Btu/lb and the heat transferred from the air by cooling is 13 Btu/lb. Determine the work on the air in Btu/min and in hp. Neglect change in kinetic energy.
Two tank are connected, as shown in the figure below, both containing water. Tank A contains 0.5 kg at 400 kPa, volume of tank A 0.2 m^3, and tank B contains 1.35 kg at 250 kPa volume of tank B 0.6 m^3. The valve is now opened, and the two tanks eventually come to the same state. Determine the amount of heat transfer when the system reaches thermal equilibrium with the surrounding at 30 C

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