Chemical Engineering MCQs

Page No. 608

A cottrell precipitator makes use of the ______________ for dusty air cleaning?


aElectric spark


bCorona discharge


cAlternating current


dNone of these


View Answer Corona discharge

Bucket elevators are not suitable for the vertical lifting of __________ materials?


aFine (e.g. – 200 mesh size coal)


bSticky (e.g. clay paste)


cSmall lumpy (e.g. grains and sand)


dFree flowing



The unit of filter medium resistance is________________?


acm-1


bgm/cm-1


ccm/gm-1


dgm-1


View Answer cm-1

A tube mill as compared to a ball mill__________________?


aEmploys smaller balls


bGives finer size reduction but consumes more power


cHas larger length/diameter ratio (>2 as compared to 1 for ball mill)


dAll A., B. and C.


View Answer All A., B. and C.

In case of grinding in a ball mill__________________?


aWet grinding achieves a finer product size than dry grinding


bIts capacity decreases with increasing fineness of the products


cGrinding cost and power requirement increases with increasing fineness of the products


dAll A., B. and C


View Answer All A., B. and C

The specific cake resistance for compressible sludges is a function of the pressure drop__________________?


aOver cake


bOver medium


cOverall


dNone of these


View Answer Over cake

Vacuum filter is most suitable for the_______________?


aRemoval of fines from liquid


bLiquids having high vapour pressure


cLiquids of very high viscosity


dNone of these


View Answer None of these

Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?


aSphere


bCube


cCylinder (L/D = 1)


dRaschig rings


View Answer Sphere

Cumulative analysis for determining surface is more precise than differential analysis, because of the_______________?


aAssumption that all particles in a single fraction are equal in size


bFact that screening is more effective


cAssumption that all particles in a single fraction are equal in size, is not needed


dNone of these



Float and sink test determines the possibility of cleaning of coal by a process based on the___________________?


aGravity separation


bWettability


cParticle shape


dNone of these


View Answer Gravity separation

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