Power is generated by using high-pressure air and a turbine. Air, flowing at 2 kg/s enters an insulated turbine at 1200 kPa and 400ºC and exits at 120 kPa. Assume negligible kinetic energy change and constant specific heat. The maximum power produced by the turbine is nearest:
A) 420 kW
B) 570 kW
C) 650 kW
D) 710 kW
C) 650 kW
Using k = 1.4 the exiting temperature is 
Using the first law, with Cp from Table B-2 (the average Cp value from Table B-6 could also be used with only a 3% effect on the answer), the power is
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