The pressure and temperature of air change from (5.5000x10^0) bar to (1.00x10^0) bar and from (7.900x10^2) K to (4.0600x10^2) K, respectively, in an air turbine operating under steady adiabatic conditions. Air flow rate through the turbine is (7.0000x10^-1) kg/s. Determine the change in specific entropy of air as it flows through the turbine. Assume Cp 1005 J/kg-K and R =287 J/kg-K. Answer should be in J/kg-K with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Ancwor

The pressure and temperature of air change from (5.5000x10^0) bar to (1.00x10^0) bar and from (7.900x10^2) K to (4.0600x10^2) K, respectively, in an air turbine operating under steady adiabatic conditions. Air flow rate through the turbine is (7.0000x10^-1) kg/s. Determine the change in specific entropy of air as it flows through the turbine. Assume Cp 1005 J/kg-K and R =287 J/kg-K. Answer should be in J/kg-K with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Ancwor

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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The pressure and temperature of air change from (4.500x10^0) bar to (1.0000x10^0) bar and from (7.3000x10^2) K to (4.36x10^2) K, respectively, in an air turbine operating under steady adiabatic conditions. Air flow rate through the turbine is (6.0000x10^-1) kg/s. Determine the change in specific entropy of air as it flows through the turbine. Assume Cp = 1005 J/kg-K and R = 287 J/kg-K. %3D Answer should be in J/kg-K with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Activate Win Go to Settings to Answer 9°C 2020 立

A gas expands from an initial volume of 0.2 m3 to a final volume of 0.4 m3 in a reversible steady flow process. During the process, the pressure varies with the volume as P = 5 X 10^5 V + 7 X 10^4 where P is in N/m2 and V is in m3. The inlet line is 4 m below the outlet line and the gas enters with a negligible velocity. The internal energy of the gas decreases by 30 kJ during the process. Determine the heat transferred. Answer: Q= 58.4x10^4 J
The entropy (s) of steam at pressure P = 18 MPa and internal energy (u) = 1699.1 kJ/kg is approximately: O 5.1064 kJ/kg. K O 1.2343 kJ/kg. K O 3.8720 kJ/kg. K
13. 1.2 kg gas (R = 260 J/kg K, k = 1.395) in a Tank is stirred by a naddle until the pressure is doubled. The change in entropy is, Saved successfully C-0.568 a 0.531 b 0.547 d-0.547
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A driver applies the brakes on 1,000 kg automobile to stop from a speed of V = (70 + y/2) km/hr. Find the entropy generation assuming an ambient temperature of Tamb = 20oC: DS = _______ kJ/K (+ 1%) y=95
A quantity of an ideal gas in an isolated system expanded isothermally and reversibly at 400 K from a volume V1 to a volume V2. During the expansion, the gas absorbs 200 J of heat from the reservoir in contact with it. If the gas expanded freely V1 to a volume V2 at 400 K and absorbed 100 J of heat, what will be: (a) the entropy change of the gas; (b) the entropy change of the reservoir, and (c) the entropy change of the whole system. Answer: (0.50, 0, 0.50)
SANAE |V, a research station of The South African National Antarctic Programme (SANAP), is located on Vesleskarvet, Queen Maud Land. On a given day, 29674 J of heat leaks out of a building. The inside temperature is 22.8 °C, and the outside temperature is -20.2 °C. What is the increase in the entropy of the universe that this heat loss produces?
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Water flowing at the rate of 1 kg/s through a system is heated using an electric heater such that the specific enthalpy of the water increases by 2.50 kJ/kg and the specific entropy increases by 0.007 kJ/kg.K. The power input to the electric heater is 2.50 kW. There is no other work or heat interaction between the system and the surroundings. Assuming an ambient temperature of 300 K, the irreversibility rate of the system is
Steam enters a turbine at 100 bars and 400°C. At the exit the pressure is 1.0 bar and the entropy has increased by 0.600 kJ/kg K under adiabatic conditions. The changes in kinetic and potential energies may be neglected. (a) Determine the work, in kJ/kg. For the same initial conditions and final pressure the turbine is now run without insulation. The entropy production due to internal irreversibilities is assumed to be the same as in part (a). However, the environment at 300 K is found to have an entropy change of +0.0800 kJ/(kg steam) · K. Also, the entropy change of the steam due to heat exchange with the environment has an absolute value of 0.0460 kJ/kg · K. (b) Determine the quality of the steam at the turbine outlet, and compare to the answer from part (a). Also, (c) determine the heat transfer to the environment, in kJ/kg steam, and (d) find the amount of work output of the turbine, in kJ/kg, and compare to part (a).