Chemical Engineering MCQs

Page No. 253

Which is not an acidic refractory ?


aSilica


bFireclay


cHigh alumina refractory


dCarbon black


View Answer Carbon black

Which is an acidic refractory ?


aMagnesite


bDolomite


cFireclay


dChrome magnesite


View Answer Fireclay

In panel test for spalling resistance, the average face temperature of panel assembly is maintained at ______________ °C for 24 hours?


a700


b1000


c1600


d2000


View Answer 1600

Fireclay bricks is not used for lining the__________________?


aCupola


bGas producer


cBottom of hot metal mixer


dRoof of open hearth furnace



Fireclay refractories____________________?


aAre not resistant to the action of basic slags


bCombine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc


cShrink during firing


dAll A., B. and C.


View Answer All A., B. and C.

Silica bricks are never used for lining the____________________?


aBeehive coke ovens


bBy-product coke ovens


cDome of blast furnace stoves


dRoof of open hearth furnace


View Answer Beehive coke ovens

Refractory bricks having lower porosity have_________________________?


aHigh insulating properties


bLow heat capacity


cLow thermal conductivity


dGreater strength


View Answer Greater strength

Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?


aFireclay


bSilicon carbide


cCorundum


dSiliceous fireclay


View Answer Silicon carbide

Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors?


aBeryllia


bCarborundum


cCorundum


dThoria


View Answer Beryllia

Refractory bricks with lower permeability is produced by using __________________?


aHigher firing temperature


bHigher moulding pressure


cFiner grog size


dAll A., B. and C.


View Answer All A., B. and C.

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