A gas turbine has a perfect heat exchanger. Air enters the compressor at a temperature and pressure of 300 K and 1 bar and discharges at 475 K and 5 bar. After passing through the heat exchanger, the air temperature increases to 655 K. The temperatures of air entering and leaving the turbine are 870C and 450C, respectively. Assuming no pressure drop through the heat exchanger, compute (a) the output per kg of air, (b) the efficiency of cycle, and (c) work required to drive the compressor.