1. Air undergoes a polytropic expansion in a piston cylinder assembly. The initialtemperature of the air is 800 K and the pressure is 2 MPa. The initial volume is 0.1 L inthe cylinder. The final volume of the cylinder is 0.8 L. The final pressure is 100 kPa.a. What is the polytropic coefficient, n?b. What is the final temperature in K?c. What is the work done by the air on the piston cylinder assembly during thisprocess in J?d. What is the heat transfer that takes place during this process in J?1V

Answered: Image /qna-images/answer/428cc114-ee48-4c2c-9562-868ac0e79e7f.jpg

Answered: 1. Air undergoes a polytropic expansion…

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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If at a given temperature or pressure the thermodynamic property of water/steam is not listed, then it can be calculated by taking average by interpolation at standard temperature and pressure all of the above are correct
Consider the following : 1. For isobaric process, n=0 2. For isothermal process, n=1 3. For isochoric process, n= * 4. For Adiabatic process, n=1 Which of the above mentioned values are correct for the value of n? Select one: O a. 1,2 and 4 only O b. 1,2 and 3 only O C. 2,3 and 4 only O d. 1, 2, 3 and 4
) Two boilers, one with superheater(B1) and other without superheater(B2) are delivering equal quantities of steam into a common main. The pressure in the boiler and main is 20 bars. The temperature of the steam from a boiler with a superheater is 350oC and temperature of the steam in the main is 250oC. The steam in B2 is wet steam at 20oC. i) Draw a sketch of the problem with all thermodynamic properties from steam table shown on the sketch. ii) Determine the quantity of steam supplied by the other boiler. Take the heat capacity of steam, Cps = 2.25KJ/Kg.hgas= hg + Cps (Tsap-Tsat)
Water contained in a piston-cylinder assembly undergoes two processes in series (point 1 to point 2 and point 2 to point 3): point 1: T1 = 100°C and P1 = 5bar point 2: 71= 151.9°C and P2 = 5bar and v2 = 0.300 .300 m³ point 3: 73= 200°C and v3 = .300" kg Use the thermodynamic tables A.2, A.3, and A.4 to answer the following questions: For questions 1, 3, and 5 choose from: subcooled water, saturated water, saturated liquid, saturated vapor, superheated vapor 1) What is the thermodynamic state of water at point 1: 2- What is the specific volume of water at point 1: 3) What is the thermodynamic state of water at point 2: 4) What is the quality of water (x) at point 2: 3) What is the thermodynamic state of water at point 3: 4) What is the pressure of water at point 3: (bar) On paper draw points 1, 2, and 3 on the following P-v and T-v diagrams and show the two processes. Add number values, units, and constant pressure or temperature lines if needed. Specify which table you used to find…
1.1 Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 1.5(105 ) W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions. Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the conditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The high heating value (HHV) of the fuel is 50.02 MJ/kg. Calculate the exergy destroyed in the process described by problem 1.4. The exergy of the fuel entering this process is 51.82 MJ/Kg. The dead state temperature is 293.2 K and pressure is 1 bar. The products of combustion leave this process at the dead state. I already figured…
Task 4A metal tank contains air at 20 C and 400 kPa. The tank volume is 5 m3. It is connected through avalve to another tank containing 7 kg of air at 40 C and 300 kPa. After 10 minutes, the valve isopened, and the whole system will reach thermal equilibrium with the surroundings (T= 25 C).Determine the volume of the second tank and the final pressure of air. Explain the relationships between system constants for a perfect gas.
QUESTION 2 Consider a quantity of 2.0 kg of refrigerant R-134a. The refrigerant fills a 9.9 ft weighted piston/cylinder apparatus that is at a constant pressure of 29 psi. The system is then heated until it reaches a temperature of 86 °F. a.) What is the initial temperature of the refrigerant? b.) What is the final volume of the refrigerant? Note: Refer to property tables in appendix 1 of textbook Attach File Browse Local Files
when n = 1 in the polytropic process PVn = c, the process is referred as a. Adiabatic process b. Isobaric process c. Isothermal process d. Isochoric process
One mole of an ideal gas is heated slowly so that it goes from the PV state (P, V;) to (2P;, 2V;) in such a way that the pressure is directly proportional to the volume. (a) How much work is done on the gas in the process? (Use any variable or symbol stated above along with the following as necessary: n and R.) W = (b) How is the temperature of the gas related to its volume during this process? (Do not substitute numerical values; use variables only. Use the following as necessary: n, R, V, Vi, and P.) T = Need Help? Read It
4- y (=p g) for water at ambient temperature equals almost...........N/m³. a- 1000 b-62.4 c- 9.81 d-9810 5- y (=p g) for water at ambient temperature equals almost........... lb/ft³. a- 1000 b-62.4 C- 9.81 d-9810 6- y (=p g) for air at normal temperature and pressure is almost............ N/m³. b- 1000 b-62.4 c- 9.81 d-9810
3-4: Inlet steam at 17.5 MPa and 600 ˚C 6-1: inlet steam at a pressure of 11.16 kPa at a wetness fraction of 0.1. At state 1, the specific volume is 0.00101 m3/kg Find the specific entropy in kJ/kg at state 4 to 3 decimal places.
Closed pressure vessel contains Helium gas (MWHE2= 4) at a pressure of 20 psi (gage) and temperature of 70°F. The air is heated at constant volume to 210°F. The atmospheric pressure is 755 mm Hg. What is the final gage pressure, in psi?

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