Chemical Engineering MCQs

Page No. 259

Which is not a high alumina refractory ?


aMullite


bCorundum


cBauxite


dDolomite


View Answer Dolomite

Spalling tendency of refractories is reduced by increasing its_________________?


aPorosity


bSpecific gravity


cThermal conductivity


dStrength


View Answer Porosity

Natural silica___________________?


aMainly contains quartz


bIs not stable at high temperature


cTransforms to other allotropic forms i.e. Tridymite and Cristobalite involving very high volume changes


dAll A., B. and C.


View Answer All A., B. and C.

. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ °C?


a500


b1000


c>1350


d>2000


View Answer >1350

Carbon refractories_____________________?


aDo not burn/oxidise, when exposed to air on heating


bAre not attacked by slags, as they are not wetted by melts


cDo not resist temperature fluctuations


dHave extremely low thermal & electrical conductivities



Sillimanite is a _____________ refractory?


aBasic


bNeutral


cHigh alumina


dInsulating


View Answer High alumina

Which is required in an insulating refractory ?


aHigh thermal conductivity


bLow porosity


cBoth A. and B.


dNeither A. nor B.


View Answer Neither A. nor B.

Ganister is a source of the ________________?


aSilica


bPericlase


cLime


dNone of these


View Answer Silica

Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?


aAt the hearth bottom of the furnace on which stock is placed


bUsed for furnace insulation


cUsed in the roof of the furnace


dNone of these



Which of the following bricks should not be used, if the furnace is to be used intermittently ?


aFirebricks


bSilica bricks


cSilicon carbide bricks


dSillimanite


View Answer Silica bricks

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