An adiabatic turbine operates at steady state. Air enters the turbine at a pressure and temperature of 800kPa and 1100K, respectively, and exits at 100kPa. A temperature sensor at the turbine exit indicates that the exit air temperature is 700K. Kinetic and potential energy effects are negligible, and the air can be treated as as ideal gas. Determine if the exit temperature reading can be correct. If yes, determine the turbine isentropic efficiency.
Correct?