Chemical Engineering MCQs

Page No. 650

In paper industry, paper is dried in a _____________ dryer ?


aTunnel


bHeated cylinder


cConveyor


dFestoon


View Answer Heated cylinder

Relative humidity is the ratio of the______________________?


aPartial pressure of the vapour to the vapour pressure of the liquid at room temperature


bPartial pressure of the vapour to the vapour pressure of the liquid at gas temperature


cActual humidity to saturation humidity


dNone of these



As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches ____________________?


aThat of normal condensation


bIntegral heat of adsorption


cZero


dNone of these



Which of the following solutions will follow Raoult’s law most closely ?


aA solution of benzene, toluene and o-xylene


b35% solution of camphor in water


c35% solution of NH3 in water


dA solution of polar organic compounds (not of homologue of a series)



Mass transfer rate between two fluid phases does not necessarily depend on the ______________ of the two phases?


aChemical properties


bPhysical properties


cDegree of turbulence


dInterfacial area


View Answer Chemical properties

In a counter-current liquid extractor___________________?


aBoth liquids flow at fixed rate


bBoth liquids can have any desired flow rate


cOnly one of the liquids may be pumped at any desired rate


dLiquid’s flow rate depends upon the temperature and pressure



On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in______________________?


aGreater degree of separation with a fixed number of trays


bIncreased reboiler load


cIncreased reflux ratio


dNone of these



Mass transfer co-efficient (K) and diffusivity D. are related according to film theory as______________________?


aK ∝ D


bK ∝√D


cK ∝ D1.5


dK ∝ D2


View Answer K ∝ D

The caking of crystals can be prevented by _____________________?


aMaintaining high critical humidity


bMaintaining low critical humidity


cCoating the product with inert material


dBoth A. and C.


View Answer Both A. and C.

In distillation, overhead product contains ______________________?


aOnly one component


bTwo components


cAny number of components


dOnly saturated liquid



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