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Brayton Cycle

Air enters the compressor of an ideal air standard Brayton cycle at 100 kPa, 300 K, with  a volumetric flow rate of 5 m3/s. The compressor pressure ratio is 10. The turbine inlet  temperature is 1400 K. Which of the following is the back work ratio if the efficiency of  the turbine and compressor is 80%?

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