4.1 1 kg of steam at 20 bar, dryness fraction 0.9, is heated reversibly at constant pressureto a temperature of 300°C. Calculate the heat supplied, and the change of entropy, andshow the process on a T-s diagram, indicating the area which represents the heat flow.(415 kJ/kg; 0.8173 kJ/kg K)4.2 Steam at 0.05 bar, 100°C is to be condensed completely by a reversible constant pressureprocess. Calculate the heat rejected per kilogram of steam, and the change of specificentropy. Sketch the process on a T-s diagram and shade in the area which representsthe heat flow.(2550 kJ/kg; 8.292 kJ/kg K)4.3 0.05 kg of steam at 10 bar, dryness fraction 0.84, is heated reversibly in a rigid vesseluntil the pressure is 20 bar. Calculate the change of entropy and the heat supplied. Showthe area which represents the heat supplied on a T-s diagram.(0.0704 kJ/kg K; 36.85 kJ)4.4 A rigid cylinder containing 0.006 m' of nitrogen (molar mass 28 kg/kmol) at 1.04 bar,15°C, is heated reversibly until the temperature is 90°C. Calculate the change of entropyand the heat supplied. Sketch the process on a T-s diagram. Take the isentropic index,7, for nitrogen as 1.4, and assume that nitrogen is a perfect gas.(0.001 25 kJ/K; 0.407 kJ)4.5 1m'of air is heated reversibly at constant pressure from 15 to 300 °C, and is then cooledreversibly at constant volume back to the initial temperature. The initial pressure is1.03 bar. Calculate the net heat flow and the overall change of entropy, and sketch theprocesses on a T-s diagram.(101.5 kJ; 0.246 kJ/K)

Answered: Image /qna-images/answer/619ff22a-83c2-44aa-b672-983022a18253.jpg

4.1 1 kg of steam at 20 bar, dryness fraction 0.9, is heated reversibly at constant pressure to a temperature of 300°C. Calculate the heat supplied, and the change of entropy, and show the process on a T-s diagram, indicating the area which represents the heat flow. (415 kJ/kg; 0.8173 kJ/kg K)

4.1 1 kg of steam at 20 bar, dryness fraction 0.9, is heated reversibly at constant pressure to a temperature of 300°C. Calculate the heat supplied, and the change of entropy, and show the process on a T-s diagram, indicating the area which represents the heat flow. (415 kJ/kg; 0.8173 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

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1. Combustion gases enter the nozzle of a jet engine at 3.8 bar and 820 oC. Thenozzle 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 nozzleassuming the velocity at inlet is negligible. For the combustion gases takecp = 1.15 KJ/Kg. K and the ratio of specific heats = 1.32
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13. During a reversible process, 2.09 kg/s of gas rejects 322.9 kJ/s of heat isothermally at 25.5°C. For this gas, cp = 2.14 kJ/kg K and c, 1.62 kJ/kg K. The initial pressure is 551.7 kPa. Determine the work steady flow of the process in hp if APE = 2.8 kJ/s and AKE = 6.2 kJ/s.
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2.) There is 1.5 kgm of a gas where k = 1.3 and R = 0.38 kJ/kgm-K that undergoes an isochoric process from p1 = 0.552 MPa, t1 = 58.50C to p2 = 1.66 MPa. During the process, there %3D added 100 kJ of heat. Compute for the heat transferred, change of internal energy, and change of entropy.
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Answer no. 1
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
4*. Steam at 2 MPa and 450° C enters an isentropic nozzle with a velocity of 10 m/s and exits at 1.5 MPa. The mass flow rate is 0.2 kg/s. Calculate: a) The exit temperature. b) The velocity of the steam at the exit of the nozzle. c) The area at the exit of the nozzle.
2) Argon (ideal gas, Cp=0.5203 kJ/kg.K) at 27 ºC, 85 kPa, and 215 m/s enters a diffuser at a rate of 2 kg/s and leaves at 50 ºC. The exit area of the diffuser is 500 cm2. The gas is estimated to lose heat at a rate of 20 kJ/s during this process. Required: Draw a standard and clear schematic of the problem and label the performance of the schematic. Perform step by step energy and mass analyses, state your assumptions and determine the following:a) The exit velocityb) The inlet areac) The inlet pressure of the Argon