Chemical Engineering MCQs

Page No. 593

The capacity of a classifier in ‘tons of solid/hr’ is given by (where, A = cross-sectional area in m2, V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m3)_________________?


a3.6 AVS.ρ


b3.6 A.V.ρ


c3.6 A.S. ρ


d3.6 AVS/ρ


View Answer 3.6 AVS.ρ

Out of the following size reduction equipments, the maximum feed size can be accepted by the__________________?


aTube mill


bBall mill


cJaw crusher


dJet pulveriser


View Answer Jaw crusher

During size reduction by a jaw crusher, the energy consumed decreases with the__________________?


aDecreasing size of product at constant size of feed


bDecreasing machine capacity


cIncreasing size of feed at constant reduction ratio


dNone of these



Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of__________________?


aBronze


bStainless steel


cFlint or porcelain


dConcrete


View Answer Flint or porcelain

The mechanism of size reduction by a hammer mill is by impact and attrition between the________________?


aGrinding element & the housing


bFeed particles


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Solid particles separation based on the difference in their flow velocities through fluids is termed as the__________________?


aClarification


bClassification


cElutriation


dSedimentation


View Answer Classification

Size reduction mechanism used in Jaw crushers is__________________?


aAttrition


bCompression


cCutting


dImpact


View Answer Compression

Wet sieving is employed, when the product contains ________________ materials?


aAbrasive


bLarge quantity of very fine


cCoarse


dNon-sticky



According to Taggart’s rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than_______________?


a0.00184


b0.0184


c0.184


d1.84


View Answer 0.0184

What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls ?


a0.5


b1.0


c2.76


d0.66


View Answer 0.66

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