Chemical Engineering MCQs

Page No. 592

Ultrafine grinders operate principally by_________________?


aSlow compression


bImpact


cAttrition


dCutting action


View Answer Attrition

Sauter mean diameter is the same as the ______________ mean diameter?


aMass


bArithmetic


cVolume-surface


dGeometric


View Answer Volume-surface

Rod mills employed for grinding_________________?


aEmploy a steel shell having L/D ratio of 1.5 to 3.0


bIs useful for handling sticky materials


cEmploy steel rods of 2-12 cms diameter extending over full length of the mill


dAll A , B & C


View Answer All A , B & C

Crushing efficiency of a machine ranges between __________________ percent?


a0.1 to 2


b5 to 10


c20 to 25


d50 to 70


View Answer 0.1 to 2

_____________________ baffles are provided in ball mills ?


aHorizontal


bNo


cOnly two


dNone of these


View Answer Horizontal

To remove very small amount of tiny solid impurities from liquid, we use a_____________________?


aPressure filter


bVacuum filter


cCentrifugal filter


dCoagulant


View Answer Coagulant

In case of a hammer crusher ?


aCrushing takes place by impact breaking


bMaximum acceptable feed size is 30 cms


cReduction ratio can be varied by adjusting the distance from cage to hammers


dAll A., B. and C.


View Answer All A., B. and C.

Screen efficiency is______________________?


aRecovery/rejection


bRecovery


cRejection


dNone of these


View Answer None of these

Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a ______________ conveyor?


aFlight


bSlat or drag


cRibbon


dScrew


View Answer Screw

For a turbine agitated and baffled tank, operating at low Reynold’s number (based on impeller diameter), the power number (Np) varies with NRe as_________________?


aNp ∝ NRe


bNp ∝ √NRe


cNp → constant


dNp ∝ 1/NRe


View Answer Np ∝ 1/NRe

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