Chemical Engineering MCQs

Page No. 625

Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are________________?


aCarbonates


bSulphates


cSilicates & phosphates


dBi-carbonates



Toothed roll crushers achieve size reduction by___________________?


aTearing (shear) and compression


bImpact and attrition


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Separation of isotopes is generally done using a/an _______________ centrifuge?


aUltra


bDisk-bowl


cBoth A. & B.


dNeither A. nor B.


View Answer Ultra

Grinding efficiency of a ball mill is of the order of _______________ percent?


a1-5


b40-50


c75-80


d90-95


View Answer 1-5

Cement clinker is reduced to fine size by a _____________________?


aRoll crusher


bBall mill


cTube mill


dHammer mill


View Answer Tube mill

In screen analysis, the notation +5 mm/-10 mm means particles passing through ____________________?


a10 mm screen and retained on 5 mm screen


b5 mm screen and retained on 10 mm screen


cBoth 5 mm and 10 mm screens


dNeither 5 mm nor 10 mm screen



The critical speed of a trommel (N) is related to its dia D. as _____________________?


aN ∝ 1/√D


bN ∝ √D


cN ∝ D


dN ∝ 1/D


View Answer N ∝ 1/√D

A _______________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream?


aThickener


bClassifier


cStrainer


dClarifier


View Answer Strainer

At low Reynold’s number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5: Power number Re = ρ N D2/μ: Reynold’s number N is the impeller rotational speed, and D is the impeller diameter ?


aPo ∝ Re-1.0


bPo ∝ Re0.0


cPo ∝ Re0.5


dPo ∝ Re1.0


View Answer Po ∝ Re0.0

Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________?


a> 10


b< 10


c> 100


d< 100


View Answer < 10

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