Chemical Engineering MCQs

Page No. 647

In the absorption of ammonia in water, the main resistance to absorption is by the _________________ phase?


aLiquid


bGas


cBoth A. & B.


dNeither A. nor B.


View Answer Gas

Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around _____________ inches?


a5


b30


c60


d100


View Answer 30

In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter ?


a> 4 :1


b< 8 : 1


c> 8:1


d< 6:1


View Answer > 8:1

Heat sensitive materials with very high latent heat of vaporisation may be economically separated using__________________?


aLiquid extraction


bDistillation


cEvaporation


dAbsorption


View Answer Liquid extraction

A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?


aComposition of vapors and that of liquid do not vary throughout the column


bReboiler load and condenser load are minimum


cThe top and bottom compositions are unchanged with and without total reflux


dThe top and bottom compositions correspond to the maximum enrichment available



Batch tray dryers suffers from the disadvantage of______________________?


aHigh maintenance cost


bNon-uniform & low production rate


cHigh labour cost & low heat economy


dAll ‘a’, ‘b’ & ‘c’



Smoke is an example of ___________________?


aSolid dispersed in liquid


bSolid dispersed in gas


cLiquid dispersed in gas


dGas dispersed in liquid



Rotary dryers cannot handle _______________ materials ?


aFree flowing


bDry


cSticky


dGranular


View Answer Sticky

Prandtl number for water at 20°C is about ________________?


a7


b70


c0.7


d150


View Answer 7

The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is___________________?


a+ve


b-ve


cZero


dNone of these


View Answer +ve

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