Chemical Engineering MCQs

Page No. 615

For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid ?


aKozeny-Carman equation


bLeva’s equation


cBlake-Plummer equation


dNone of these



During the washing of cake_________________?


aAll the resistances are constant


bFilter medium resistance increases


cFilter medium resistance decreases


dCake resistance decreases



_____________ mills are termed as impactors?


aHammer


bCage


cRolling-compression


dNone of these


View Answer Hammer

For coarse reduction of hard solids, use ____________________?


aImpact


bAttrition


cCompression


dCutting


View Answer Compression

Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ?


aP/m = K/ √Dp


bP/m = K . ln D̅ sa/D̅ sb


cP/m = K . (1/ D̅ sb – 1/D̅ sa)


dNone of these



______________ mill is not a revolving mill ?


aPebble


bCompartment


cCage


dTube


View Answer Cage

The crushed material received for separation is called feed or_________________?


aTailing


bHeading


cConcentrate


dMiddling


View Answer Heading

A filter press is___________________?


aA batch filter


bNot suitable, if the liquid is the main product


cHaving prohibitively high maintenance cost


dNot suitable for wide range of materials under varying operating conditions of cake thickness and pressure


View Answer A batch filter

About 2-3 hp, power per gallon of a thin liquid provides vigorous agitation in an agitator. ‘Power number’ in agitation is given by __________________?


aP. gc/n3. D2. ρ


bP. gc. ρ/μ2


cn3. D3. ρ/P. gc


dP. gc/n2. D2. ρ


View Answer P. gc/n3. D2. ρ

Pick out the material having minimum Rittinger’s number?


aCalcite


bPyrite


cQuartz


dGalena


View Answer Galena

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