Chemical Engineering MCQs

Page No. 75

Henry’s law is closely obeyed by a gas, when its _____________ is extremely high?


a Pressure


b Solubility


c Temperature


dNone of these


View Answer None of these

“Dry ice” is________________?


aMoisture free ice


b Solid helium


cSolid carbon dioxide


d None of these


View Answer Solid carbon dioxide

What is the ratio of adiabatic compressibility to isothermal compressibility ?


a1


b< 1


c> 1


d>> 1


View Answer < 1

Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is___________________?


a300 × (32/7)


b300 × (33/5)


c300 × (333/7)


d300 × (35/7)


View Answer 300 × (32/7)

The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are ?


a1


b 2


c3


d0


View Answer 2

A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is φi yi P = Yi xifi° where, Φ is a vapor fugacity component, Yi is the liquid activity coefficient and fi° is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?


aTemperature only


bTemperature and pressure only


cTemperature, pressure and liquid composition xi only


d Temperature, pressure, liquid composition xi and vapour composition yi



Gibbs-Duhem equation relates composition in liquid phase and the _____________ at constant temperature & pressure?


a Fugacity


bPartial pressure


cActivity co-efficient


dAll (A), (B), and (C)


View Answer All (A), (B), and (C)

Critical temperature is defined as the temperature above which a gas will____________________?


aNot liquify (barring exceptions)


b Immediately liquify


c Never liquify however high the pressure may be


dNone of these



The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?


aReversible isothermal volume change


b Heating of a substance


cCooling of a substance


dSimultaneous heating and expansion of an ideal gas



With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure___________________?


aIncreases


b Decreases


cRemain same


dDecreases linearly


View Answer Increases

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