A combined cycle is to produce electricity byt otal heat supply of 1061 MW from the combustion chamber. The total compressor work is 120 MW and the total turbine work

is400 MW. The turbine exhaust enters the HRSG that produces steam to a steam turbine where it generates 149 MW a) calculate the efficiency of gas turbine only (6 points) b) calculate the efficiency of combine system (6 points)