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

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bCage mill

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cStamp mill

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dBradford’s breaker

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View Answer Cage mill

Which of the following is not a wet classifier ?


aSharpies super-centrifuge

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bHydrocyclones

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cDorr Oliver rake classifier

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dNone of these

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View Answer None of these

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


aCompression

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bInterparticle attrition

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cCutting

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dImpact

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


aSeparation of isotopes based on their density or molecular weights difference

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bConcentration of rubber latex

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cSeparation of cream from milk

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dDewaxing of lubricating oil

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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

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bPre-coated on the filter medium prior to filtration

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

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dAll A, B. & C.

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View Answer All A, B. & C.

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


a1 – 2

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b15 – 20

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c40 – 50

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d60 – 75

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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

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b2/D.ρ

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c4/D.ρ

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d12/D.ρ

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View Answer 6/D.ρ

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


aTrommel

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bGrizzly

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cShaking screen

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dVibrating screen

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View Answer Vibrating screen

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


aLength to diameter ratio

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bSize of the grinding media

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cFinal product size

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dOperating speed

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


aDensity of the liquid

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bViscosity of the liquid

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cCube of impeller diameters

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dSquare of rotational speed

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View Answer Density of the liquid

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