Section C5. (a) Air is compressed in a diesel engine cylinder. The initial pressure and temperatureare 105 kN/m and 25 °C respectively, and the final pressure is to be 7 MN/m. Inorder to ignite the fuel charge injected at the end of compression, the temperaturerequired is 700°E. Calculate the ratio of the initial to final volume for this to bepossible. Assumtng that the compression process is polytropic, find the polytropicindex of the compression process.

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Answered: Air is compressed in a diesel engine…

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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During the compression stroke of a certain gasoline engine, the pressure increases from 1.00 atm to 20.0 atm.Assuming that the process is adiabatic and that the gas isideal, with (a) by what factor does the volumechange and (b) by what factor does the temperaturechange? (c) If the compression starts with 0.016 0 mol ofgas at 27.0°C, find the values of Q , W, and Eint thatcharacterize the process
I've already found T2 and A2 for part A. They are T2 = 310.2K and A2 = .0139m^2. But I can't figure out how to find the rate of entropy production with units KW/K (that's what my questions seems to be asking for, but it may be a typo). All of the solutions for this problem here on Bartelby find the rate of entropy production with units KW / (K*kg).
Steam at 7 bar, dryness fraction 0.96, is throttled-down to 3.5 bar. Solve for the change of entropy per unit mass of steam and show the process on T-s diagram.
Methane is heated in a steady-flow process at approximately atmospheric pressure. 1000 kJ of heat is added to 10 moles of methane initially at 500.0K. Note: There can be more than 1 exiting temperature that can give a heat of 1000 kJ. For this one, the exiting temperature does not exceed 3500 K. 1. What is the entropy change of the gas? 12.89 J/K 128.93 J/K а. b. C. 1289.30 J/K d. 12893.00 J/K
A confined volume of 27 moles an ideal gas (with y = 1.42) goes through an expansion process so at the final volume is six times the initial volume, and the final pressure is one eighth the initial ressure. a. What is the final temperature in terms of the initial temperature? b. What is the total change in entropy for the gas?
Problem 8 Calculate the change in the entropies of the system (AS.99) and the surroundings (ASsur), and the total entropy change (ASotal) when a sample of 1.0 mol of an ideal gas at 300 K and 1.0 bar triples its volume in: a) isothermal reversible expansion b) isothermal expansion against a vacuum (Psurr = 0) c) Will the process in (a) occur spontaneously? What about the process in (b)? Why or why not? %3D
Q.9 Steam is expanded isentropic ally in the high pressure cylinder of a steam turbine from a pressure of 2 Mpa at 350 °C to 0.1 Mpa. Isentropic expansion is then continued down to 7 KN/m2 in the low pressure cylinder. Calculate the percentage of the total work output that is performed by the H.P cylinder.
17. An ideal gas of molecular mass 30 and specific heat ratio 1.38 is compressed according to the law pul 25 = constant, from a pressure of 1 bar and 60°C to a pressure of 16 bar. Calculate the temperature at the end of compression, the heat received or rejected and workdone by the gas during the process. Assume 1 kg mass of the gas. Use only calculated values of c, and c n
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(17 blanks) Calculate the efficiency of the Carnot Engine for ideal gas. Consider the figure below for a complete cycle of Carnot engine, where the cycle goes from ad->ab->bc->cd Carnot cycle Он TH Tc - V 02016 Pearson Education, Inc. processes: processes and segment ab & cd are the Where segments ad & bc are the and the volumes involved are Va, Vb, Vc, Vd, and the two temperatures TC and
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