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
In which there is an increase in temperature
Which can be performed in a pipe with a constriction
In which there is a temperature drop

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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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