Chemical Engineering MCQs

Page No. 618

In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of _______________ crushing?


aPrimary

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bSecondary

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cFine

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dUltrafine

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View Answer Fine

Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripheral velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m3 here, V =πND where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m) ?


a3.6 V.W.Dr.ρ

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b3.6 V.W. ρ

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c3.6 W.Dr.ρ

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d3.6 V.W.Dr/ρ

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View Answer 3.6 V.W.Dr.ρ

Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called__________________?


aClassification

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bFroth floatation

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cThickening

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dClarification

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View Answer Classification

The controlling resistance in a rotary drum vacuum filter is the ________________ resistance?


aPiping

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bCake

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cFilter medium

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dNone of these

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View Answer Cake

To get a fine talc powder from its granules, the equipment used is____________________?


aRoller crusher

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bBall mill

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cJaw crusher

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dGyratory crusher

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View Answer Ball mill

As per Taggart’s formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms) ?


aLS

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b93 LS

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c250 LS

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d√(LS)

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View Answer 93 LS

With increase in the capacity of screens, the screen effectiveness__________________?


aRemains unchanged

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bIncreases

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cDecreases

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dDecreases exponentially

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View Answer Decreases

Filtration of water in a paper mill is done by a/an _______________ filter?


aOpen sand

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bPlate and frame

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cVacuum leaf

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dSparkler

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View Answer Open sand

Reciprocal of sphericity is termed as the________________?


aSpecific surface ratio

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bShape factor

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cSauter diameter

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dSurface area per unit mass

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View Answer Shape factor

As particle size is reduced__________________?


aScreening becomes progressively more difficult

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bScreening becomes progressively easier

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cCapacity and effectiveness of the screen is increased

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dNone of these

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