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


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


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



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


aBlake jaw


bToothed roll


cGyratory


dNone of these


View Answer Toothed roll

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


aThickeners


bClassifiers


cHydrocyclones


dDecanters


View Answer Classifiers

Use of grinding aids results in the ___________________?


aEnhanced production rate


bFiner products


cBoth A. & B.


dNeither A. nor B.


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


b50


c70


d85


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


cSize


dVolatile matter content


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)


c½ √(g/r)


d2π. √(g/r)


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


b1.5


c2


d2.5


View Answer 1.5

Removal of activated carbon from glycerine is done by _________________?


aPlate and frame filter


bRotary vacuum filter


cBatch basket centrifuge


dNone of these



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


bElectrostatic precipitator


cCyclone separator


dWet scrubber



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