Chemical Engineering MCQs

Page No. 599

The material is crushed in a gyratory crusher by the action of__________________?


aImpact


bCompression


cAttrition


dCutting


View Answer Compression

Production rate _____________ with increased fineness, with a given energy input to the size reduction machine?


aDecreases


bIncreases


cRemains unchanged


dMay increase or decrease; depends on the machine


View Answer Decreases

Fick’s law relates to_________________?


aEnergy consumption


bFinal particle size


cFeed size


dNone of these


View Answer Energy consumption

Cartridge filters are termed as ‘edge’ filters, because of the fact that the_________________?


aDisks have very sharp edge


bSolids are not deposited at the edge of the disk


cBulk of the solids are removed at the periphery of the disks


dNone of these



Moisture can be removed from lubricating oil using_________________?


aTubular centrifuge


bClarifier


cSparkler filter


dVacuum leaf filter


View Answer Tubular centrifuge

Hot, lumpy & abrasive materials are best transported by using a/an ___________ conveyor ?


aApron


bBelt


cScrew


dFlight


View Answer Apron

What is the selectivity index, if the grade of tailings & concentrate is the same ?


a0


b


c1


d0.5


View Answer 1

The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond’s law, Rittinger’s law and Kick’s law) depend upon the_________________?


aFeed material


bType of crushing machine


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

______________ mean diameter of particles is given by Σ (xi/Dpi ⃗)?


aMass


bVolume


cArithmetic


dVolume surface


View Answer Volume

Horsepower required for a roll crusher is directly proportional to its__________________?


aReduction ratio


bCapacity


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

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