Chemical Engineering MCQs

Page No. 585

Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed ?


aWet grinding in low viscous suspension


bWet grinding in high viscous suspension


cDry grinding of large particles (upto 1.25 cms)


dDry grinding of large particles in un-baffed mills



A tube mill compared to a ball mill__________________?


aHas a higher length/diameter ratio


bProduces a coarser product


cHas a higher diameter/length ratio


dUses much larger balls



Grizzlies are used for separating _____________ solids?


aCoarse


bFine


cAny size


dNone of these


View Answer Fine

In closed circuit grinding as compared to open circuit grinding, the_________________?


aSpecific surface of product is more


bProduct has lesser size uniformity


cProduction rate at a given limiting size is lower


dOperation is economical



In bag filters, filter fabrics are never made of__________________?


aMetallic wire woven mesh


bPolyester fibres


cCotton fibres


dNylon fibres



For crushing of solids, the Rittinger’s law states that the work required for crushing is proportional to __________________?


aThe new surface created


bThe size reduction ratio


cThe change in volume due to crushing


dNone of these



Which of the following screens has the maximum capacity ?


aGrizzlies


bTrommels


cShaking screen


dVibrating screen


View Answer Vibrating screen

For spheres, volume shape factor is given by____________________?


aπ = (A/D2)


b2π = (2A/D2)


cπ/6 = (V/D3)


dAD/V


View Answer π/6 = (V/D3)

The inlet pressure in a constant rate filtration____________________?


aIncreases continuously


bDecreases gradually


cRemains constant


dNone of these



Trommels separate a mixture of particles depending on their_____________________?


aSize


bDensity


cWettability


dElectrical & magnetic properties


View Answer Size

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