Chemical Engineering MCQs

Page No. 598

Crushing of mineral particles is accomplished in a ‘cage mill’, when one or more alloy steel bars are revolved in opposite directions. It is a type of ______________ mill?


aImpact

✓


bRoll

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cVibratory

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dNone of these

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View Answer Roll

A compressible cake has the_________________?


aMaximum porosity at the upstream side

✓


bMaximum porosity at the filter medium

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cSame porosity throughout the cake thickness

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dNone of these

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Filter medium resistance is important during the ______________ of filtration?


aEarly stages

✓


bFinal stages

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cEntire process

✖


dNone of these

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View Answer Early stages

Diatomaceous earth is a/an_________________?


aExplosive

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bFilter aid

✓


cFilter medium

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dCatalyst

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View Answer Filter aid

Sedimentation on commercial scale occurs in____________________?


aClassifiers

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bThickeners

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cRotary drum filters

✓


dCyclones

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View Answer Rotary drum filters

Filter aid is used to____________________?


aIncrease the rate of filtration

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bDecrease the pressure drop

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cIncrease the porosity of the cake

✓


dAct as a support base for the septum

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In a roll crusher, the specific power consumption and the production rate is affected by the_________________?


aReduction ratio

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bDifferential roll speed

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cBoth A. and B.

✓


dNeither A. nor B.

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View Answer Both A. and B.

The value of ‘angle of nip’ is generally about__________________?


a16°

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b32°

✓


c52°

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d64°

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View Answer 32°

For classification of potable (drinking) water, we use a _______________ filter?


aGravity sand

✓


bPlate and frame

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cVacuum leaf

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dRotary vacuum

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View Answer Gravity sand

Trommels employ _____________ for screening of materials?


aFibrous cloth

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bWoven wire screen

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cPunched plate

✓


dNone of these

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View Answer Punched plate

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