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

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b9.0 kWh/ton

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c18 kWh/ton

✓


d25.4 kWh/ton

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View Answer 18 kWh/ton

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


aBuhrstone

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bRoller

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cAttrition

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dPebble

✓


View Answer Pebble

Jigging is a technique by which different particles can be____________________?


aSeparated by particle size

✓


bSeparated by particle density

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cSeparated by particle shape

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dMixed

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


aGyratory crusher

✓


bBall mill

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cTube mill

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dSquirrel-cage disintegrator

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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

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cCrushing rolls

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dHammer mill

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View Answer Buhrstone mill

_____________ is the most commonly used ‘filter aid’?


aDiatomaceous earth

✓


bFuller’s earth

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cVermiculite

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dSemi-plastic clay

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View Answer Diatomaceous earth

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


aDispersing gas in liquid

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bBlending of immiscible liquids

✓


cDispersing immiscible liquid in form of emulsion

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dSuspending solid particles

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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

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cVolume as the particle

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dNone of these

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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

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b½w2 . δ2 . ρL

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c½w2 . δρL (2R + δ)

✓


d½w2 . R . ρL(R + 2δ)

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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

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b20

✓


c25

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d30

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View Answer 20

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