Chemical Engineering MCQs

Page No. 596

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


aMicronizers


bAgitated mills and fluid energy mills


cToothed roll crusher


dHammer mills with internal classification


View Answer Toothed roll crusher

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


aAttrition


bImpact


cBoth A. & B.


dNeither A. nor B.


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


bThickness


cLength


dNone of these


View Answer Speed

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


aRod mills


bGyratory crushers


cJaw crushers


dSmooth roll crushers


View Answer Rod mills

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


aM ∝ √D


bM ∝ D2


cM ∝ D3


dM ∝ D


View Answer M ∝ D3

A pebble mill_________________?


aIs a ball mill


bEmploys flints or ceramic pebbles as the grinding medium


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


dBoth B. and C.


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


bPeclet


cBrinkman


dSchmidt


View Answer Peclet

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


aCollector


bFrother


cModifier


dActivator


View Answer Collector

In a roll crusher, both the rolls_________________?


aHave the same diameter


bAre rotated towards each other


cRun either at the same or different speeds


dAll A., B. and C.


View Answer All A., B. and C.

Balls for ball mills are never made of_________________?


aForged/cast steel


bLead


cCast iron


dAlloy steel


View Answer Lead

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