Chemical Engineering MCQs

Page No. 270

Grog addition in fireclay during brick manufacture is done to_________________?


aReduce its shrinkage on heating


bImpart greater spalling resistance


cEnhance the strength of fired refractories


dAll A., B. and C.


View Answer All A., B. and C.

Carbon bricks are not used in the lining of the_________________?


aCombustion chamber of blast furnace stoves


bElectric furnaces


cHighly chemical resistant equipments


dBlast furnace hearth



Machine moulding of dry mixture of refractories requires a pressure of the order of _____________ kg/cm2?


a10


b100


c500


d1000


View Answer 1000

Porosity is induced in insulating refractories by adding________________?


aPowdered naphthalene


bAmmonium chloride/sulphate


cCalcium phosphate


dAll A., B. and C.


View Answer All A., B. and C.

Segar cones are used for the determination of ____________ of refractories?


aSoftening temperature


bSpalling resistance


cElectrical conductivity


dResistance to slag attack


View Answer Softening temperature

Fusion point of an acidic refractory material is________________?


aIncreased by the addition of basic oxides


bReduced by the addition of basic oxides


cNot affected by the addition of basic oxides


dAlways more than 2500°C



An ideal refractory should have high__________________?


aSpalling rate


bFusion point


cShrinkage ability


dNone of these


View Answer Fusion point

Carbon refractories have very high __________________?


aWetting characteristics


bRefractoriness


cThermal conductivity


dBoth B. and C.


View Answer Both B. and C.

Zirconia refractory_________________?


aDoes not react with basic slags


bIs produced from baddeleyite


cCannot be used as an insulator


dHas poor electrical conductivity at high temperature



Graphite or carbon refractories______________________?


aExhibit wetting characteristics


bShould be used in neutral or reducing atmosphere


cExhibit high shrinkage on thermal treatment


dAre not resistant to corrosion by slag



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