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Which one of the following statements regarding a Rankine cycle is FALSE?

1. Superheating the steam in the boiler increases the cycle efficiency.
2. The pressure at the turbine outlet depends on the condenser temperature.
3. Cycle efficiency increases as condenser pressure decreases.
4. Cycle efficiency increases as boiler pressure decreases.

Correct answer: Cycle efficiency increases as boiler pressure decreases.

Solution

The statement is false because increasing the boiler pressure actually enhances the cycle efficiency by allowing the working fluid to absorb more heat, leading to a higher thermal efficiency. Lowering the boiler pressure would reduce the temperature difference between the heat source and the working fluid, thus decreasing efficiency.

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