Chemical Engineering MCQs

Page No. 626

_______________ centrifuge is the most suitable for separation of non-friable crystals?


aTubular bowl


bDisc-bowl


cPerforated horizontal basket continuous


dSuspended batch basket



In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the ________________ crushing?


aSecondary


bFine


cPrimary


dUltrafine


View Answer Primary

Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________?


aBritish standard screens


bGerman standard screens (DIN 1171) etc


cAmerican standard screens (ASTM and Tyler standard screens)


dAll A., B. and C.


View Answer All A., B. and C.

The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the _____________ filter?


aVacuum


bSand


cPlate & frame


dRotary


View Answer Sand

Which of the following gives the crushing energy required to create new surface ?


aTaggarts rule


bFick’s law


cRittinger’s Law


dNone of these


View Answer Rittinger’s Law

Sphericity of raschig ring (whose length and diameter are equal) is___________________?


a> 1


b< 1


c1


d2


View Answer 1

Energy consumed for crushing one ton of material ranges from ______________ kWh?


a0.01 to 0.1


b0.5 to 1.5


c2 to 3.5


d4 to 5


View Answer 0.5 to 1.5

Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?


a200°C and 5 atm


b1000°C and 10 atm


c500°C and 50 atm


d1000°C and 500 atm


View Answer 1000°C and 10 atm

Separation of materials of the same density based on their sizes by using then-different rates of flow is called__________________?


aSorting


bSizing


cFlocculation


dElutriation


View Answer Sizing

The specific surface of spherical particles is proportional to (where, Dp = diameter of particle)?


aD2


bDp


c1/Dp


d1/D2p


View Answer 1/Dp

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