Chemical Engineering Thermodynamics
Which of the following will increase the volume of a real gas by four times ?

Reducing the temperature to half and doubling the pressure
Reducing temperature to one fourth at constant pressure
Doubling the absolute temperature as well as pressure of the gas
Reducing pressure to one fourth at constant temperature

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Chemical Engineering Thermodynamics
High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:

Δ H ≠ 0 and ΔS ≠ 0
Δ H ≠ 0 and ΔS = 0
Δ H = 0 and ΔS ≠ 0
Δ H = 0 and ΔS = 0

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