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


bSecondary


cFine


dUltrafine


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


b3.6 V.W. ρ


c3.6 W.Dr.ρ


d3.6 V.W.Dr/ρ


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


bFroth floatation


cThickening


dClarification


View Answer Classification

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


aPiping


bCake


cFilter medium


dNone of these


View Answer Cake

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


aRoller crusher


bBall mill


cJaw crusher


dGyratory crusher


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


b93 LS


c250 LS


d√(LS)


View Answer 93 LS

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


aRemains unchanged


bIncreases


cDecreases


dDecreases exponentially


View Answer Decreases

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


aOpen sand


bPlate and frame


cVacuum leaf


dSparkler


View Answer Open sand

Reciprocal of sphericity is termed as the________________?


aSpecific surface ratio


bShape factor


cSauter diameter


dSurface area per unit mass


View Answer Shape factor

As particle size is reduced__________________?


aScreening becomes progressively more difficult


bScreening becomes progressively easier


cCapacity and effectiveness of the screen is increased


dNone of these



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