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Which 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?

1. Increasing the boiler pressure.
2. Decreasing the boiler pressure.
3. Increasing the turbine inlet temperature.
4. Decreasing the condenser pressure.

Correct answer: Increasing the turbine inlet temperature.

Solution

Increasing the turbine inlet temperature raises the average temperature at which heat is added to the cycle, thereby improving thermal efficiency and reducing the moisture content of the steam at the turbine outlet.

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