Chemical Engineering MCQs

Page No. 252

In isotropic turbulence, the _____________ are equal to each other?


aTemporal velocity components


bMean square of velocity fluctuations in the three co-ordinate directions


cRoot mean square of velocity fluctuations in the three co-ordinate directions


dNone of these



Purpose of relief valve in a reciprocating pump is to___________________?


aProtect the pump against developing excessive pressure


bFacilitate unidirectional flow of liquid


cReduce the discharge pressure


dControl the rate of discharge



Stoke’s equation is valid in the Reynolds number range__________________?


a0.01 to 0.1


b0.1 to 2


c2 to 10


d10 to 100


View Answer 0.01 to 0.1

Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?


aSilicon carbide


bSilicon nitride


cCrystalline magnesia


dZirconium sulphate


View Answer Silicon carbide

Permeability of bricks is a measure of the_________________?


aRefractoriness


bMelting point


cRate at which a fluid will pass through the pores


dExpansion during heating



Fireclay bricks are not used in the_____________________?


aBlast furnace


bHot blast stove


cCupola


dWall of coke oven


View Answer Wall of coke oven

Which form of silica has the highest specific gravity ?


aQuartz


bCristobalite


cTridymite


dAll have the same specific gravity


View Answer Quartz

Thermal conductivity of refractory bricks_________________?


aIncreases with decrease in porosity


bDecreases with decreases in porosity


cIs independent of its porosity and is maximum for insulating bricks


dIncreases with the amount of air entrapped in pores



Fusion point of a basic refractory material is__________________?


aReduced by the addition of acid oxides


bIncreased by the addition of acid oxides


cNot affected by the addition of acid oxides


dAlways less than 1000°C



Fireclay bricks are used in the__________________?


aCoke ovens regenerator


bOuter lining of L.D. converter


cHearth bottom of blast furnace


dCoke oven walls



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