Air enters a turbine at 800 kPa, 1200 K, and expands in a reversible adiabatic process to 100 kPa. Calculate the exit temperature and the work output per kilogram of air, using
a. The ideal gas tables, Table A.7
b. Constant specific heat, value at 300 K from table A.5
c. Constant specific heat, value at an intermediate temperature from Fig. 5.10 Discuss why the method of part (b) gives a poor value for the exit temperature and yet a relatively good value for the work output.