Chemical Engineering MCQs

Page No. 620

Which of the following is a vacuum filter ?


aFilter press


bRotary disc filter


cBatch basket centrifuge


dTank filter (Nutsche filter)


View Answer Rotary disc filter

A fluid energy mill is used for_________________?


aCutting


bGrinding


cUltra grinding


dCrushing


View Answer Ultra grinding

Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?


aSand bed filter


bPlate and frame filter press


cVacuum filter


dBatch basket centrifuge


View Answer Vacuum filter

The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)__________________?


a∝ ΔP


b∝ 1/ ΔP


c∝ √ΔP


dIndependent of ΔP


View Answer Independent of ΔP

Filtration capacity of a rotary drum vacuum filter depends upon the_______________?


aCake thickness


bCharacteristics of the feed slurry


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Bond crushing law_________________?


aCalls for relatively less energy for the smaller product particles, than does the Rittinger law


bIs less realistic in estimating the power requirements of commercial crushers


cStates that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product


dStates that the work required for the crushing is proportional to the new surface created



Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle)?


a6.V/D.S


bV/6D.S


cD.S/V


dV/D.S


View Answer 6.V/D.S

A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for _______________ flow of filtrate?


aCompressible cakes and laminar


bIncompressible cake and laminar


cCompressible cake and turbulent


dIncompressible cake and turbulent



Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with ______________ to get the same for dry grinding?


a1.0


b0.5


c1.34


d4.34


View Answer 1.34

Which of the following is not used as a surface active agent in a flocculation operation ?


aSodium silicate


bQuartz


cLime


dAlumina


View Answer Quartz

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