Chemical Engineering MCQs

Page No. 624

In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the _____________ crushing?


aPrimary


bSecondary


cFine


dUltrafine


View Answer Secondary

General mechanism of size reduction in intermediate and fine grinder is by __________________?


aCutting action


bCompression


cCompression and tearing


dImpact and attrition


View Answer Impact and attrition

Screen capacity is expressed in terms of____________________?


atons/hr


btons/ft2


cBoth A. & B.


dtons/hr-ft2


View Answer tons/hr-ft2

Crushing efficiency is the ratio of the ______________________ ?


aSurface energy created by crushing to the energy absorbed by the solid


bEnergy absorbed by the solid to that fed to the machine


cEnergy fed to the machine to the surface energy created by crushing


dEnergy absorbed by the solid to the surface energy created by crushing



Which one is a filter aid ?


aCanvas fabric


bDiatomaceous earth


cCalcined lime


dNone of these


View Answer Diatomaceous earth

A propeller agitator_______________?


aProduces mainly axial flow


bIs used for mixing high viscosity pastes


cRuns at very slow speed (2 rpm)


dAll A., B. and C.



Shell and leaf filter as compared to plate and frame filter _____________________?


aEntails less labor cost


bFacilitates filtration under higher pressure


cProvides more effective washing


dAll A., B. & C.


View Answer All A., B. & C.

Length/diameter ratio of a ball mill is __________________ ?


a1.5


b1


c< 1


d> 1


View Answer < 1

Mixing mechanism employed in a pan mixer is by ________________?


aMulling


bKneading


cDispersion


dNone of these


View Answer Mulling

Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?


a0.01 L.S


b0.087 L.S


cL.S


dL.S/0.087


View Answer 0.087 L.S

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