Chemical Engineering Thermodynamics
An irreversible process

Is the analog of linear frictionless motion in machines
Yields an amount of work less than that of a reversible process
Is an idealised visualisation of behaviour of a system
Yields the maximum amount of work

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

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