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

See similar textbooks

Similar questions

Steam enters a turbine stage with pressure of 5 bar, specific volume of 0.125m³ /kgm and an enthalpy of 3620 kJ/kgm at 75 m/s and leaves the same stage with pressure of 1200 mm Hg, specific volume of .0345 m³ /kgm and an enthalpy of 2800 kJ/kgm at 128 m/s. Calculate the work done by the steam.
10- Argon enters an isentropic turbine at 450°C and exits at 150°C. If the turbine power is requested as 0.5 MW, which of the following is the required mass flow rate? A) 0,867 kg/s B) 1,667 kg/s C) 8,013 kg/s D) 0,312 kg/s E) 3,203 kg/s
Q13: 15 kg of air per minute is delivered by a centrifugal compressor. The inlet and outlet conditions of air are / C * l = 10 m/s, pl = 1 bar, v1=0.5 m3/kg and C2= 1 80 m/s , p2=7 bar, v2=0.15 m3/kg . The increase in enthalpy of air passing through the compressor is 60 kg/kg , and heat loss to the surroundings is 720 kJ/min. Assuming that inlet and discharge lines are at the same level, find : (i) Motor power required to drive the compressor. (ii) Ratio of inlet to outlet pipe diameter
Determine the velocity of the air at exit from the nozzle when the inlet velocity is negligibly small. If Air from a source at 10 bar and 200°C is throttled to 7 bar before expanding through a nozzle to a pressure of 1.01325 bar. Assuming that the air flows reversibly in steady flow through the nozzle, and that no heat is rejected,
In a jet engine, the emitter, compressor, turbine and nozzle operate at isentropic pressure, while the combustion chamber operates at constant pressure. At the inlet of the emitter, the temperature of the air is 230 K, the pressure is 25 kPa, the flow rate is 30 kg/s and the speed is 200 m/s. Since the pressure of the air at the compressor outlet is 500 kPa, the temperature of the air at the turbine inlet is 1000 K and the pressure of the air at the nozzle outlet is 25 kPa,a) Draw the flow diagram of the cycle schematically.b) Find the velocity of the gases at the nozzle exit.c) Find the amount of heat supplied to the combustion chamber.d) Find the reaction force, reaction force and reaction efficiency.
8-The pressure of saturated water vapor is increased to 1300 kPa at a temperature of 170°C, under reversible continuous flow conditions, while keeping its specific volume constant. Which of the following is required for this process? A) 205,6 kJ/k B) 123,2 kJ/kg C) 98,8 kJ/kg D) 565,7 kJ/kg E) 110,0 kJ/kg
Air enters the compressor of a simple gas turbine at p1 = 14 lbf/in2, T1 = 520°R. The isentropic efficiencies of the compressor and turbine are 83 and 87%, respectively. The compressor pressure ratio is 12 and the temperature at the turbine inlet is 2500°R. The volumetric flow rate of the air entering the compressor is 9000 ft3/min. Use an air-standard analysis. a) Determine the net power developed, in Btu/h. b) Determine the thermal efficiency of the cycle. c) The temperatures at the compressor and turbine exits in °R.
A regenerator of 75 percent effectiveness is used in an air-standard Brayton cycle working between pressures of 15 psia and 75 psia. Determine the work per pound of air and the efficiency of the cycle if the maximum and minimum temperatures of the cycles are 1700 R and 550 R, respectively.
34 - Helium enters a continuous flow compressor at 326 K and leaves at 441 K. If the mass flow rate is 1.5 kg/s, which of the following is the required power? (Cp = 5.1926 kJ/kgK) a) 988.7 kW B) 895.7 kW NS) 617.9 kW D) 927.9 kW TO) 836.0 kW
A mole of an ideal, diatomic gas undergoes isothermal, reversible expansion from 1.0 dm 3 to 10.0 dm 3 at 100 oC. If the same gas undergoes irreversible expansion against a constant pressure of 1.00 bar, which of the following quantities would change? A. Internal Energy B. Enthalpy C. Free Energy D. Entropy
A turbine, operating under steady-flow conditions, receives X1 kg of steam per hour (For X1 refer Table. 1). The steam enters the turbine at a velocity of 3000 m/min, an elevation of 5 m and a specific enthalpy of 2787 kJ/kg. It leaves the turbine at a velocity of 6000 m/min, an elevation of 1 m and a specific enthalpy of 2259 kJ/kg. Heat losses from the turbine to the surroundings amount to 16736 kJ/h. Determine the power output of the turbine.
A low pressure air compressor develops a pressure of 0.145 bar. If the initial and the finalstates of air are p1=1.02 bar, T1=300 K, and T2 =314 K, estimate the isentropic andinfinitesimal stage efficiencies. A second compressor changes the state of air from initial statesof p1=1.02 bar, T1=300 K to p2=2.52 bar with an efficiency of 75 %. Determine theinfinitesimal efficiency of this compressor. Explain the large deviation in the efficiency of thiscompressor from that of the low pressure compressor.