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GATE 2019 ME (ME2) – Question 23

Thermal Engineering Applications · Power Engineering: vapour and gas power cycles, regeneration and reheat · 1 mark · Multiple choice

Which modification of the simple ideal Rankine cycle increases efficiency and reduces turbine-outlet steam moisture?

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

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Show answer and explanation

Correct answer: (C) Increasing turbine inlet temperature

Explanation

Increasing turbine-inlet temperature increases the average temperature of heat addition and raises cycle efficiency. It also moves the turbine expansion endpoint toward a higher steam quality at fixed condenser pressure. Thus **increasing turbine-inlet temperature,C**,improves both measures.