Chemical Engineering Thermodynamics
Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

Superheated vapour
Partially condensed vapour with quality of 0.1
Saturated vapour
Partially condensed vapour with quality of 0.9

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Chemical Engineering Thermodynamics
The adiabatic throttling process of a perfect gas is one of constant enthalpy

Which is exemplified by a non-steady flow expansion
Which can be performed in a pipe with a constriction
In which there is a temperature drop
In which there is an increase in temperature

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