Chemical Engineering MCQs

Page No. 631

The Knudsen diffusivity is dependent on the ______________________?


aMolecular velocity only


bPore radius of the catalyst only


cMolecular mean free path only


dMolecular velocity and pore radius of the catalyst



Overall efficiency of the distillation column is _____________________?


aThe ratio of number of ideal plates to actual plates


bThe ratio of number of actual plates to ideal plates


cSame as the Murphree efficiency


dAlways more than the point efficiency



For a binary mixture with low relative volatility, continuous rectification to get pure products will require_____________________?


aLow reflux ratio


bLess number of trays


cSmall cross-section column


dHigh reflux ratio


View Answer High reflux ratio

Critical humidity of a solid salt means the humidity_____________________?


aAbove which it will always become damp


bBelow which it will always stay dry


cBoth A. and B.


dAbove Which it will always become dry and below which it will always stay damp


View Answer Both A. and B.

CO2 can be absorbed by____________________?


aHot cupric oxide


bHeated charcoal


cCold Ca(OH)2


dAlumina


View Answer Heated charcoal

The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is_________________?


aNatural draft cooling tower


bInduced draft cooling tower


cSpray chamber


dNone of these


View Answer Spray chamber

Solvent used in extractive distillation___________________?


aChanges the relative volatility of the original components


bShould be of high volatility


cShould form azeotropes with the original components


dAll A., B. and C.



Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is_________________?


aLess


bMore


cSame


dUnpredictable


View Answer Less

Which of the following remains constant during evaporative cooling process with recirculated water supply ?


aRelative humidity


bPartial pressure of vapour


cWet bulb temperature


dNone of these


View Answer Wet bulb temperature

If a two phase system is in physical equilibrium; then it means that, the_____________________?


aEscaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase


bTemperature of the liquid phase is equal to that of the vapor phase


cTotal pressure throughout the liquid phase is equal to that throughout the vapor phase


dAll A., B. and C.


View Answer All A., B. and C.

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