Air enters the compressor of a gas turbine at 100 kPa and 300 K with a volume flow rate of 5 m3/s. The compressor pressure ratio is 10 and its isentropic efficiency is 85%. At the inlet to the turbine, the pressure is 950 kPa and the temperature is 1400 K. The turbine has an isentropic efficiency of 88% and the exit pressure is 100 kPa. On the basis of an air-standard analysis, what is the thermal efficiency of the cycle in percent? a. 42.06        c. 31.89 b. b. 60.20    d. 25.15 in a gas turbine operating on the air-standard cycle, the air enters the compressor at 100 kPa and 30oC at the rate of 20 m3/s and is compressed to 500 kPa. The maximum temperature is 780oC and the exit pressure of the turbine

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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  1. Air enters the compressor of a gas turbine at 100 kPa and 300 K with a volume flow rate of 5 m3/s. The compressor pressure ratio is 10 and its isentropic efficiency is 85%. At the inlet to the turbine, the pressure is 950 kPa and the temperature is 1400 K. The turbine has an isentropic efficiency of 88% and the exit pressure is 100 kPa. On the basis of an air-standard analysis, what is the thermal efficiency of the cycle in percent?
    a. 42.06        c. 31.89
    b. b. 60.20    d. 25.15
  2. in a gas turbine operating on the air-standard cycle, the air enters the compressor at 100 kPa and 30oC at the rate of 20 m3/s and is compressed to 500 kPa. The maximum temperature is 780oC and the exit pressure of the turbine is 100 kPa. Determine the net turbine power.
    a. 4853 kW       c. 4483 kW
    b. 4358 kW       d. 4538 kW
  3. A gas turbine working on air-standard Brayton cycle has air enter into the compressor at atmospheric condition and 22oC. The pressure ratio is 9 and the maximum temperature in the cycle is 1077oC. Compute for the cycle efficiency per kg of air in percent.
    a. 44.85%          c. 41.65%
    b. b. 43.92%      d. 42.62%
  4. What is the thermal efficiency of an air-standard Brayton cycle if the pressure ratio is 10
    a. 48.21%          c. 45.36%
    b. b. 50.16%      d. 42.44%
  5. Air is drawn into a gas turbine working on the constant pressure cycle at 1 bar 21oC and compressed to 5.7 bar. The temperature at the end of heat supply is 680oC. Taking expansion and compression to be adiabatic where cV= 0.718 kJ/kg-K, cP = 1.055 kJ/kg-K, calculate the heat energy supplied per kg at constant pressure.
    a. 472 kJ/kg       c. 501 kJ/kg
    b. 389 kJ/kg       d. 489 kJ/k
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