Chemical Engineering MCQs

Page No. 617

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


aClassification

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bTabling

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cJigging

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dFroth floatation

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View Answer Froth floatation

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


aDrag

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bRibbon

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cScrew

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dSlat

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View Answer Ribbon

Sphericity of pulverised coal is__________________?


a1

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b< 1

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c> 1

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d∞

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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

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bDp/Df

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cDf – Dp

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dNone of these

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View Answer Df/Dp

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


aAttrition

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bCompression

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cImpact

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dCutting

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View Answer Impact

Which of the following is a fine crusher ?


aBlake jaw crusher

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bGyratory crusher

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cToothed roll crusher

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dDodge jaw crusher

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View Answer Toothed roll crusher

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


aTumbler

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bBanbury

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cMuller

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dRibbon blender

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View Answer Banbury

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


aπ = (A/D2)

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bπ/6 = (V/D3)

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cAD/V

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dNone of these

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View Answer π = (A/D2)

Gravity stamp mill is meant for the ___________________ crushing?


aPrimary

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bIntermediate

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cFine

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dUltrafine

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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

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bDry chemicals

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cHeavy tonnages of rocks or gravel

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dPowdered food & granular materials

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