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Q5. A gas turbine plant operates on the ideal air standard Joule cycle. The maximum temperature and pressure are 1200 K and 6 bar respectively. The minimum temperature and pressure are 300 K and 1 bar respectively.
The turbine exhaust passes through a heat exchanger and supplies heat to an ideal Rankine cycle steam plant which operates between pressures of 40 bar and 0.1 bar. The steam leaves the heat exchanger dry and saturated. The exhaust gas leaves the heat exchanger at the saturation temperature of the evaporating steam. Feed pump work in the Rankine cycle plant may be disregarded.
Determine EACH of the following:

(a) the mass of steam per kg of air; (6)

(b) the thermal efficiency of the combined plant. (10)

Note:  For air, γ = 1.4 and c_P = 1.005 kJ/kg K.