Discussion
Which one of the following statements regarding a Rankine cycle is FALSE?
Answer: D
The false statement is Cycle efficiency increases as boiler pressure decreases.
Raising the boiler pressure raises the average temperature at which heat is added, so Rankine cycle efficiency increases with boiler pressure (the practical limit being the moisture content at the turbine exit). Lowering the boiler pressure does the opposite.
The other statements are true. Superheating raises the mean temperature of heat addition and so increases efficiency. The turbine exhausts into the condenser, where the steam is saturated, so the turbine outlet pressure is the saturation pressure at the condenser temperature. And lowering the condenser pressure lowers the temperature of heat rejection, which increases efficiency.
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