Chemical Engineering MCQs

Page No. 611

Size reduction of fibrous materials like wood, asbestos, mica etc. is done by a disintegrator exemplified by the _________________?


aBlake jaw crusher


bCage mill


cStamp mill


dBradford’s breaker


View Answer Cage mill

Which of the following is not a wet classifier ?


aSharpies super-centrifuge


bHydrocyclones


cDorr Oliver rake classifier


dNone of these


View Answer None of these

Maximum size reduction in a fluid energy mill is achieved by___________________?


aCompression


bInterparticle attrition


cCutting


dImpact



Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________?


aSeparation of isotopes based on their density or molecular weights difference


bConcentration of rubber latex


cSeparation of cream from milk


dDewaxing of lubricating oil



Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?


aAdded to the feed slurry


bPre-coated on the filter medium prior to filtration


cSeparated from the cake by dissolving solids or by burning it off


dAll A, B. & C.


View Answer All A, B. & C.

Trommels are revolving screens which normally operate in the range of _______________ rpm?


a1 – 2


b15 – 20


c40 – 50


d60 – 75


View Answer 15 – 20

The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ?


a6/D.ρ


b2/D.ρ


c4/D.ρ


d12/D.ρ


View Answer 6/D.ρ

For sizing of fine materials, the most suitable equipment is a____________________?


aTrommel


bGrizzly


cShaking screen


dVibrating screen


View Answer Vibrating screen

The main differentiation factor between tube mill and ball mill is the ___________________?


aLength to diameter ratio


bSize of the grinding media


cFinal product size


dOperating speed



During agitation of liquids, power consumption during laminar flow is not proportional to the ________________?


aDensity of the liquid


bViscosity of the liquid


cCube of impeller diameters


dSquare of rotational speed


View Answer Density of the liquid

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