Chemical Engineering MCQs

Page No. 614

Ball mill is used for__________________?


aCrushing

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bCoarse grinding

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cFine grinding

✓


dAttrition

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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

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bAt the end of filtration

✓


cWhen half the filtrate has been obtained

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dAt the end of filtration, but decreases with time subsequently

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Paddle agitator_________________?


aIs suitable for mixing low viscosity liquids

✓


bProduces axial flow

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cMoves at very high speed

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dNone of these

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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

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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

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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

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


a0.0074 cm

✓


b0.0074 mm

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c0.0047 cm

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d74 milli-microns

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View Answer 0.0074 cm

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


aRequires more energy

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bHas less capacity

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cComplicates handling & classification of the product

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dNone of these

✓


View Answer None of these

Which of the following is a continuous filter ?


aPlate and frame filter

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bCartridge filter

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cShell and leaf filter

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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___________________?


aN°

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bN1

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cN2

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dN3

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View Answer N2

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


aSmallest

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bLargest

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cEither A. or B.

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dNeither A. nor B.

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View Answer Neither A. nor B.

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


aBall mill

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bRod mill

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cFluid energy mill

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dJaw crusher

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View Answer Jaw crusher

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