Chemical Engineering MCQs

Page No. 596

Which of the following is not an ultrafine grinder (colloid mill) ?


aMicronizers

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bAgitated mills and fluid energy mills

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cToothed roll crusher

✓


dHammer mills with internal classification

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View Answer Toothed roll crusher

The grinding in a hammer crusher takes place due to the_______________?


aAttrition

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bImpact

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cBoth A. & B.

✓


dNeither A. nor B.

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View Answer Both A. & B.

The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the _____________ of the belt?


aSpeed

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bThickness

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cLength

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dNone of these

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View Answer Speed

Size reduction does not occur due to compression in case of________________?


aRod mills

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bGyratory crushers

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cJaw crushers

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dSmooth roll crushers

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View Answer Rod mills

Mass flow of granular solid (M) through a circular opening of dia, D follows_____________________?


aM ∝ √D

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bM ∝ D2

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cM ∝ D3

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dM ∝ D

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View Answer M ∝ D3

A pebble mill_________________?


aIs a ball mill

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bEmploys flints or ceramic pebbles as the grinding medium

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cIs a tube mill lined with ceramic or other non-metallic liner

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dBoth B. and C.

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View Answer Both B. and C.

In a mixer, the quantity, (v. L/D) is termed as __________ number (where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing) ?


aWeber

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bPeclet

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cBrinkman

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dSchmidt

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View Answer Peclet

In froth floatation, chemical agent added to cause air adherence is called___________________?


aCollector

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bFrother

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cModifier

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dActivator

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View Answer Collector

In a roll crusher, both the rolls_________________?


aHave the same diameter

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bAre rotated towards each other

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cRun either at the same or different speeds

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dAll A., B. and C.

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View Answer All A., B. and C.

Balls for ball mills are never made of_________________?


aForged/cast steel

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bLead

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cCast iron

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dAlloy steel

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View Answer Lead

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