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GATE 2017 ME (ME2) – Question 52

Thermal Engineering Applications · Power Engineering: vapour and gas power cycles, regeneration and reheat · 2 marks · Numerical answer

In a Rankine cycle, turbine inlet and exit enthalpies are 2803 and 1800 kJ/kg; pump inlet and exit enthalpies are 121 and 124 kJ/kg. Specific steam consumption is ______ kg/kWh.

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Correct answer: 3.5 to 3.7

Explanation

Turbine work is2803−1800=1003kJ/kg and pump work is124−121=3kJ/kg. Net work is1000kJ/kg. Producing1kWh requires3600kJ, so specific steam consumption is3600/1000=**3.6kg/(kW·h)**. Ignoring pump work would use gross turbine output.