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

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bLeva’s equation

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cBlake-Plummer equation

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dNone of these

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During the washing of cake_________________?


aAll the resistances are constant

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bFilter medium resistance increases

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cFilter medium resistance decreases

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dCake resistance decreases

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_____________ mills are termed as impactors?


aHammer

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bCage

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cRolling-compression

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dNone of these

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View Answer Hammer

For coarse reduction of hard solids, use ____________________?


aImpact

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bAttrition

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cCompression

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dCutting

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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

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bP/m = K . ln D̅ sa/D̅ sb

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cP/m = K . (1/ D̅ sb – 1/D̅ sa)

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dNone of these

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______________ mill is not a revolving mill ?


aPebble

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bCompartment

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cCage

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dTube

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View Answer Cage

The crushed material received for separation is called feed or_________________?


aTailing

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bHeading

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cConcentrate

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dMiddling

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View Answer Heading

A filter press is___________________?


aA batch filter

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bNot suitable, if the liquid is the main product

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cHaving prohibitively high maintenance cost

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

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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

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bP. gc. ρ/μ2

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cn3. D3. ρ/P. gc

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dP. gc/n2. D2. ρ

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View Answer P. gc/n3. D2. ρ

Pick out the material having minimum Rittinger’s number?


aCalcite

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bPyrite

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cQuartz

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dGalena

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View Answer Galena

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