Chemical Engineering MCQs

Page No. 620

Which of the following is a vacuum filter ?


aFilter press

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bRotary disc filter

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cBatch basket centrifuge

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dTank filter (Nutsche filter)

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View Answer Rotary disc filter

A fluid energy mill is used for_________________?


aCutting

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bGrinding

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cUltra grinding

✓


dCrushing

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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

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bPlate and frame filter press

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cVacuum filter

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dBatch basket centrifuge

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View Answer Vacuum filter

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


a∝ ΔP

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b∝ 1/ ΔP

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c∝ √ΔP

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dIndependent of ΔP

✓


View Answer Independent of ΔP

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


aCake thickness

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bCharacteristics of the feed slurry

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cBoth A. & B.

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dNeither A. nor B.

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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

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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

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

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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

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bV/6D.S

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cD.S/V

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dV/D.S

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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

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bIncompressible cake and laminar

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cCompressible cake and turbulent

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dIncompressible cake and turbulent

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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

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b0.5

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c1.34

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d4.34

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View Answer 1.34

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


aSodium silicate

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bQuartz

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cLime

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dAlumina

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View Answer Quartz

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