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Chemical Engineering Thermodynamics

Chemical Engineering Thermodynamics
Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole.

None of these
25
273
0

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Chemical Engineering Thermodynamics
At the critical point of a substance

There is no distinction between liquid and vapour phases
Liquid and vapour have the same density
All of these
The surface tension vanishes

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

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

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Chemical Engineering Thermodynamics
An ideal liquid refrigerant should

Have low specific heat
Both A and B
Not have unduly high vapour pressure at the condenser temperature
Not have a subatmospheric vapour pressure at the temperature in the refrigerator coils

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Chemical Engineering Thermodynamics
Enthalpy changes over a constant pressure path are always zero for __________ gas.

A real
Any
A perfect
An easily liquefiable

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Chemical Engineering Thermodynamics
Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.

Separating
Throttling
Bomb
Bucket

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