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Chemical Engineering Thermodynamics

Chemical Engineering Thermodynamics
In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when

N = 0
N = 1
N = 1.66
N = y = 1.4

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Chemical Engineering Thermodynamics
Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in

Decreased COP
Increased or decreased COP ; depending upon the type of refrigerant
Same COP
Increased COP

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Chemical Engineering Thermodynamics
The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is

(∂S/∂V)T = (∂P/∂T)V
(∂S/∂P)T = -(∂V/∂T)P
(∂T/∂V)S = -(∂P/∂S)V
(∂V/∂S)P = (∂T/∂P)S

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Chemical Engineering Thermodynamics
When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is

Same in both the phases
More in vapour phase
More in liquid phase
Replaced by chemical potential which is more in vapour phase

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Chemical Engineering Thermodynamics
Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are

Same at the same reduced temperature
Always greater than one
Same at the same reduced pressure
Both B & C

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Chemical Engineering Thermodynamics
At normal boiling point, molar entropy of vaporisation is __________ Joule/K°.mole.

92
192
142
72

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