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

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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

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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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