Chemical Engineering MCQs

Page No. 622

Pick out the wrong statement ?


aMore commonly used jaw crusher between Dodge jaw crusher and Blake jaw crusher is the later one

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bThere are only four methods namely compression, impact, attrition and cutting, which the size reduction equipments employ

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cCutting machines mainly employ ‘attrition’ for size reduction of solids

✓


dOperating principles of Dodge and Blake jaw crushers are combined in the working of universal jaw crushers

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Size reduction of ice and gypsum can be accomplished suitably by a _______________ crusher?


aBlake jaw

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bToothed roll

✓


cGyratory

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dNone of these

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View Answer Toothed roll

______________ are used for the separation of coarse particles from a slurry of fine particles?


aThickeners

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bClassifiers

✓


cHydrocyclones

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dDecanters

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View Answer Classifiers

Use of grinding aids results in the ___________________?


aEnhanced production rate

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bFiner products

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Neither A. nor B.

In a ball mill, the volume occupied by the balls (when the mill is stopped) is about _______________ percent of the volume of the mill?


a35

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b50

✓


c70

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d85

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View Answer 50

Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the____________________?


aDensity separation

✓


bDifferential wettability

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cSize

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dVolatile matter content

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View Answer Density separation

Critical speed of rotation, N (in rps – rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre.) ?


a(1/2π). √(g/r)

✓


b(1/π). √(g/r)

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c½ √(g/r)

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d2π. √(g/r)

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View Answer (1/2π). √(g/r)

General crushing equation is given by d(P/m) = -K (dD̅ S/D̅ n S). Bond’s crushing law is obtained by solving this equation for n = _____________ and feed of infinite size?


a1

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b1.5

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c2

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d2.5

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View Answer 1.5

Removal of activated carbon from glycerine is done by _________________?


aPlate and frame filter

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bRotary vacuum filter

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cBatch basket centrifuge

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dNone of these

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The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________?


aBag filter

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bElectrostatic precipitator

✓


cCyclone separator

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dWet scrubber

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