Chemical Engineering MCQs

Page No. 161

________________ decreases during adiabatic throttling of a perfect gas?


aEntropy


bTemperature


cEnthalpy


dPressure


View Answer Pressure

Change of state namely evaporation condensation, freezing and melting is an _______________ process?


a Isothermal


bAdiabatic


cIsobaric


dIsochoric


View Answer Isothermal

Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?


aWork required to refrigeration obtained


bRefrigeration obtained to the work required


cLower to higher temperature


dHigher to lower temperature



Claude gas liquefaction process employs cooling___________________?


aAt constant pressure


b By throttling


cBy expansion in an engine


dNone of these



Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be___________________?


a Same


bDoubled


cHalved


dOne fourth of its original value


View Answer Same

The activity of an ideal gas is numerically ____________ its pressure?


aMore than


bLess than


cEqual to


dData insufficient, can’t be predicted


View Answer Equal to

Any substance above its critical temperature exists as _____________________?


aSaturated vapour


bSolid


c Gas


dLiquid


View Answer Gas

Clausius-Clapeyron Equation gives accurate result, when the __________________?


aVapour pressure is relatively low and the temperature does not vary over wide limits


bVapour obeys the ideal gas law and the latent heat of vaporisation is constant


c Volume in the liquid state is negligible compared with that in the vapour state


dAll A, B. and C


View Answer All A, B. and C

The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is____________________?


a0


b+ve


c-ve


d


View Answer +ve

In polytropic process (PVn = constant), if n = 1; it means a/an ______________ process?


aAdiabatic


bReversible


c Isothermal


dNone of these


View Answer Isothermal

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