Chemical Engineering MCQs

Page No. 617

There is practically no alternative/competitor to _________________ in the beneficiation treatment of sulphide ores?


aClassification


bTabling


cJigging


dFroth floatation


View Answer Froth floatation

Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a ______________ conveyor?


aDrag


bRibbon


cScrew


dSlat


View Answer Ribbon

Sphericity of pulverised coal is__________________?


a1


b< 1


c> 1


d


View Answer < 1

The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively) ?


aDf/Dp


bDp/Df


cDf – Dp


dNone of these


View Answer Df/Dp

Maximum size reduction in a ball mill is done by the, ______________ action?


aAttrition


bCompression


cImpact


dCutting


View Answer Impact

Which of the following is a fine crusher ?


aBlake jaw crusher


bGyratory crusher


cToothed roll crusher


dDodge jaw crusher


View Answer Toothed roll crusher

_______________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution?


aTumbler


bBanbury


cMuller


dRibbon blender


View Answer Banbury

For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter) ?


aπ = (A/D2)


bπ/6 = (V/D3)


cAD/V


dNone of these


View Answer π = (A/D2)

Gravity stamp mill is meant for the ___________________ crushing?


aPrimary


bIntermediate


cFine


dUltrafine


View Answer Fine

Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the ___________________?


aLight metal powder down upto 4 mesh size


bDry chemicals


cHeavy tonnages of rocks or gravel


dPowdered food & granular materials



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