Chemical Engineering MCQs

Page No. 255

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


aKyanite

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bSillimanite

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cDiaspore

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dPericlase

✓


View Answer Periclase

Which is not a natural insulating material ?


aDiatomaceous earth/kieselgur

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bAsbestos

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cVermiculite

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dNone of these

✓


View Answer None of these

Magnesite bricks have poor resistance to attack by _____________ slag?


aLime

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bBasic

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cAcid

✓


dNone of these

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View Answer Acid

______________ bricks should not be used in oxidising atmosphere?


aTar dolomite

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bCarbon

✓


cSilica

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dFireclay

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View Answer Carbon

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


aStrength

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bThermal conductivity

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cSpalling resistance

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dNone of these

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View Answer Spalling resistance

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


aSilica

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bFireclay

✓


cMagnesite

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dZirconia

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View Answer Fireclay

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


a0.5

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b1

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c2

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d3.5

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View Answer 3.5

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


aFireclay

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bSilica

✓


cDolomite

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dVery low alumina

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View Answer Silica

Dilatometer is used for the determination of ______________ of refractories?


aModulus of rupture

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bPermanent linear change

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cResistance to CO attack

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dRUL

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


aAlumina

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bThoria

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cZirconia

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dMagnesia

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View Answer Thoria

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