Chemical Engineering MCQs

Page No. 594

The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?


a6.35 kWh/ton


b9.0 kWh/ton


c18 kWh/ton


d25.4 kWh/ton


View Answer 18 kWh/ton

_______________ mill is not used for grinding wheat into flour and for milling of cereals & other ?


aBuhrstone


bRoller


cAttrition


dPebble


View Answer Pebble

Jigging is a technique by which different particles can be____________________?


aSeparated by particle size


bSeparated by particle density


cSeparated by particle shape


dMixed



For the preliminary breaking of hard rock, we use a____________________?


aGyratory crusher


bBall mill


cTube mill


dSquirrel-cage disintegrator


View Answer Gyratory crusher

For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a__________________?


aBuhrstone mill


bBall mill


cCrushing rolls


dHammer mill


View Answer Buhrstone mill

_____________ is the most commonly used ‘filter aid’?


aDiatomaceous earth


bFuller’s earth


cVermiculite


dSemi-plastic clay


View Answer Diatomaceous earth

Which of the following is not accomplished by agitation of liquids in agitators ?


aDispersing gas in liquid


bBlending of immiscible liquids


cDispersing immiscible liquid in form of emulsion


dSuspending solid particles



Equivalent diameter of a particle is the diameter of the sphere having the same __________________?


aRatio of surface to volume as the actual volume


bRatio of volume to surface as the particle


cVolume as the particle


dNone of these



A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is ___________________?


a½w2 . R2 . ρL


b½w2 . δ2 . ρL


c½w2 . δρL (2R + δ)


d½w2 . R . ρL(R + 2δ)



The basic filtration equation is given as dt/dV = (μ/A ΔP). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?


a10


b20


c25


d30


View Answer 20

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