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Q4. In a steam plant, using reheat, the turbine receives the steam at n pressure and temperature of 30 bar and 500°C respectively. The steam expands In the first stage until it Is just dry saturated at 1. 5 bar.

It is then reheated at constant pressure to 400°C and Is isentropically expanded in the second stage to a condenser pressure of 0.05 bar.

The feed pump work can be neglected and there Is no undercooling In the condenser.

(a) Sketch the T-s diagram for the cycle.

(b) Calculate EACH of the following:

(i) the net work from the turbines per kg of steam;

(ii) the thermal efficiency.