Chemical Engineering MCQs

Page No. 603

With increase in drum speed, in a rotary drum filter, the filtration rate_______________?


aIncreases

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bIncreases linearly

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cIncreases linearly

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dIs not affected

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View Answer Increases

Gravity settling process is not involved in the working of a________________?


aHydrocyclone

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bClassifier

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cDorr-thickener

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dSedimentation tank

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View Answer Hydrocyclone

Ball mills and tube mills with flint or porcelain balls are used for size reduction of_______________?


aAsbestos

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bRubber

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cNon-metallic ores

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dLimestone

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View Answer Non-metallic ores

Grinding characteristic of a material is given by its___________________?


aHGI

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bAngle of repose

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cShatter index

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dAbrasion index

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View Answer HGI

Which of the following is not categorised as a “mechanical operation”?


aAgitation

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bFiltration

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cSize enlargement

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dHumidification

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View Answer Humidification

For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately _____________ microns?


a5

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b50

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c500

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d5000

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View Answer 500

Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?


a0.007

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b0.30

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c50

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d0.014

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View Answer 0.30

____________ mills fall in the category of tumbling mills ?


aBall and pebble

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bRod and tube

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cCompartment

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dAll A., B. & C.

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View Answer All A., B. & C.

____________ conveyor is the most suitable for long distance transportation of cold, nonabrasive granular/irregular shape/fine materials?


aBucket

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bBelt

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cScrew

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dApron

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View Answer Belt

A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?


a0.50

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b0.58

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c0.68

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d0.62

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View Answer 0.50

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