GATE 2016 ME (ME3) – Question 54
Steam at an initial enthalpy of 100 kJ/kg and inlet velocity of 100 m/s, enters an insulated horizontal nozzle. It leaves the nozzle at 200 m/s. The exit enthalpy (in kJ/kg) is __________
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Correct answer: 84 to 86
Explanation
Steady adiabatic flow without shaft work or elevation change gives h₁+V₁²/2000=h₂+V₂²/2000 when h is in kJ/kg. Hence h₂=100+(100²−200²)/2000=**85kJ/kg**. The increase in kinetic energy is supplied by a decrease in enthalpy.