Discussion
A power plant operates on a simple ideal Rankine cycle. If superheating is added to this cycle, then which one of the following options is CORRECT ?
Answer: C
The correct option is pump work remains same, turbine work output increases, cycle efficiency increases, and moisture content at turbine exit decreases.
Superheating changes only the boiler exit state at the same pressures. The pump still raises the same liquid between the same pressures, so its work is unchanged. The steam enters the turbine hotter, so the expansion delivers more work, and heat is added at a higher mean temperature, which raises the efficiency.
The expansion line also starts further right on the T-s diagram, so the steam leaving the turbine is drier: the moisture content falls, which is the main practical reason for superheating. The options with increasing moisture or changed pump work are wrong.
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