Project ForgeWhich one of the following modifications of the simple ideal Rankine cycle increases the thermal efficiency and reduces the moisture content of the steam at the turbine outlet?
- AIncreasing the boiler pressure.
- BDecreasing the boiler pressure.
- Increasing the turbine inlet temperature.
- DDecreasing the condenser pressure.
Explanation
Increasing the turbine inlet (superheat) temperature raises the average temperature of heat addition, increasing efficiency, and pushes the whole expansion line further right on the T-s diagram, increasing turbine-exit quality (less moisture). Raising boiler pressure and lowering condenser pressure both increase efficiency but INCREASE moisture content; lowering boiler pressure decreases efficiency.
Source: GATE ME 2019 Session 2 (Set 3) (2019)
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