Chemical Engineering MCQs

Page No. 614

Ball mill is used for__________________?


aCrushing


bCoarse grinding


cFine grinding


dAttrition


View Answer Fine grinding

During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?


aAt time zero


bAt the end of filtration


cWhen half the filtrate has been obtained


dAt the end of filtration, but decreases with time subsequently



Paddle agitator_________________?


aIs suitable for mixing low viscosity liquids


bProduces axial flow


cMoves at very high speed


dNone of these



Rittinger’s crushing law states that_____________________?


aWork required to form a particle of any size is proportional to the square of the surface to volume ratio of the product


bWork required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product


cWork required in crushing is proportional to the new surface created


dFor a given machine and feed, crushing efficiency is dependent on the size of the feed & product



The opening of a 200 mesh screen (Taylor series) is__________________?


a0.0074 cm


b0.0074 mm


c0.0047 cm


d74 milli-microns


View Answer 0.0074 cm

In case of a revolving mill, wet grinding compared to dry grinding__________________?


aRequires more energy


bHas less capacity


cComplicates handling & classification of the product


dNone of these


View Answer None of these

Which of the following is a continuous filter ?


aPlate and frame filter


bCartridge filter


cShell and leaf filter


dNone of these


View Answer None of these

The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to___________________?


a


bN1


cN2


dN3


View Answer N2

In a grinding operation, the limiting particle size is the size of the _______________ particle in the sample?


aSmallest


bLargest


cEither A. or B.


dNeither A. nor B.


View Answer Neither A. nor B.

Feed size of ≥ 25 cms can be accepted by _______________________?


aBall mill


bRod mill


cFluid energy mill


dJaw crusher


View Answer Jaw crusher

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