Chemical Engineering MCQs

Page No. 645

The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the ______________ temperature?


aDew point


bWet bulb


cDry bulb


dNone of these


View Answer None of these

The adiabatic saturation curve for a vapour-gas mixture is__________________?


aStraight line


bSlightly concave upward


cSlightly concave downward


dNone of these



Flights in a rotary dryer are provided to________________?


aLift and shower the solids thus exposing it thoroughly to the drying action of the gas


bReduce the residence time of solid


cIncrease the residence time of the solid


dNone of these



Stefan’s law describes the mass transfer by________________?


aDiffusion


bBulk flow


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Fenske equation for determining the minimum number of theoretical stages in distillation column holds good, when the_________________?


aRelative volatility is reasonably constant


bMixture (to be separated) shows negative deviation from ideality


cMixture (to be separated) shows positive deviation from ideality


dMulti-component distillation is involved



Use of raschig rings in place of crushed stones as packing in packed beds (other things being same) ?


aIncreases pressure drop, increases surface area


bIncreases pressure drop, decreases surface area


cDecreases pressure drop, increases surface area


dDecreases pressure drop, decreases surface area



When the psychometric ratio is ______________ then the adiabatic saturation temperature and wet bulb temperature becomes equal?


a1


b


c0


d2


View Answer 1

The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by___________________?


aIncreasing the gas film co-efficient


bIncreasing the liquid film co-efficient


cIncreasing the total pressure


dDecreasing the total pressure



Liquid diffusivity is of the order of _______________ cm2 /second?


a0.01


b0.1


c10-5 to 10-6


d> 1


View Answer 10-5 to 10-6

Molecular diffusion is caused by the________________?


aTransfer of molecules from low concentration to high concentration region


bThermal energy of the molecules


cActivation energy of the molecules


dPotential energy of the molecules



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