Chemical Engineering Thermodynamics
The second law of thermodynamics states that

It is not possible to transfer heat from a lower temperature to a higher temperature
The energy change of a system undergoing any reversible process is zero
None of these
The total energy of system and surrounding remains the same

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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

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

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