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A steam turbine receives steam steadily at 10 bar with a enthalpy of 3000 kJ/kg and discharges at 1 bar with an enthalpy of 2700 kJ/kg. The work output is 250 kJ/kg. The changes in kinetic and potential energies are negligible. The heat transfer from the turbine casing to the surroundings is equal to
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- 0 kJ
- 50 kJ
- 150 kJ
- 250 kJ
Correct Option: B
∆h = ∆Q – ∆W
∴ ∆Q = (– 300 + 250) kJ/kg = – 50 kJ/kg
