Chemical Engineering MCQs

Page No. 255

Which of the following is not a high alumina refractory material ?


aKyanite


bSillimanite


cDiaspore


dPericlase


View Answer Periclase

Which is not a natural insulating material ?


aDiatomaceous earth/kieselgur


bAsbestos


cVermiculite


dNone of these


View Answer None of these

Magnesite bricks have poor resistance to attack by _____________ slag?


aLime


bBasic


cAcid


dNone of these


View Answer Acid

______________ bricks should not be used in oxidising atmosphere?


aTar dolomite


bCarbon


cSilica


dFireclay


View Answer Carbon

With decrease in porosity, the ______________ of the refractories decreases?


aStrength


bThermal conductivity


cSpalling resistance


dNone of these


View Answer Spalling resistance

Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?


aSilica


bFireclay


cMagnesite


dZirconia


View Answer Fireclay

The maximum linear expansion of silica bricks during firing is about ______________ percent?


a0.5


b1


c2


d3.5


View Answer 3.5

Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?


aFireclay


bSilica


cDolomite


dVery low alumina


View Answer Silica

Dilatometer is used for the determination of ______________ of refractories?


aModulus of rupture


bPermanent linear change


cResistance to CO attack


dRUL



Highest melting (m.p = 3070°C) oxide refractory is__________________?


aAlumina


bThoria


cZirconia


dMagnesia


View Answer Thoria

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