Chemical Engineering MCQs

Page No. 632

In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG ______________ the absorption factor?


aIncreases with increase in


bIs one at unity value of


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

If a1 and a2 are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement ?


aa1 = a2


ba1 = 2a2


ca1 = 0.5 a2


dNone of these


View Answer None of these

Percentage saturation is _______________ the relative saturation?


aAlways smaller than


bAlways greater than


cNot related to


dNone of these


View Answer Always smaller than

In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be_________________?


aLiquid phase resistance-controlled


bGas phase resistance controlled


cImpossible


dDriven by a non-linear driving force



Water-ethyl alcohol solution can be concentrated (in respect of alcohol concentration) by ________________ distillation?


aAtmospheric


bVacuum


cHigh pressure


dNone of these


View Answer Vacuum

When the temperature and humidity of air is low, we usually use _______________ draft cooling tower?


aNatural


bForced


cInduced


dNone of these


View Answer Natural

In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the__________________?


aTemperature and pressure


bConcentration


cNature of the constituents


dNone of these


View Answer None of these

Leaching of sugar from sugar beets is done by___________________?


aHot water


bHexane


cDilute H2SO4


dLime water


View Answer Hot water

In an absorber, HETP does not vary with the____________________?


aFlow rate of liquid


bFlow rate of gas


cType and size of packing


dNone of these


View Answer None of these

Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air ?


aDry bulb temperature


bDew point


cWet bulb temperature


dNone of these


View Answer Wet bulb temperature

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