Chemical Engineering MCQs

Page No. 253

Which is not an acidic refractory ?


aSilica

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bFireclay

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cHigh alumina refractory

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dCarbon black

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View Answer Carbon black

Which is an acidic refractory ?


aMagnesite

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bDolomite

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cFireclay

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dChrome magnesite

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View Answer Fireclay

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


a700

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b1000

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c1600

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d2000

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View Answer 1600

Fireclay bricks is not used for lining the__________________?


aCupola

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bGas producer

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cBottom of hot metal mixer

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dRoof of open hearth furnace

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Fireclay refractories____________________?


aAre not resistant to the action of basic slags

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

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cShrink during firing

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dAll A., B. and C.

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View Answer All A., B. and C.

Silica bricks are never used for lining the____________________?


aBeehive coke ovens

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bBy-product coke ovens

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cDome of blast furnace stoves

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dRoof of open hearth furnace

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View Answer Beehive coke ovens

Refractory bricks having lower porosity have_________________________?


aHigh insulating properties

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bLow heat capacity

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cLow thermal conductivity

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dGreater strength

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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

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bSilicon carbide

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cCorundum

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dSiliceous fireclay

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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

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bCarborundum

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cCorundum

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dThoria

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View Answer Beryllia

Refractory bricks with lower permeability is produced by using __________________?


aHigher firing temperature

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bHigher moulding pressure

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cFiner grog size

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dAll A., B. and C.

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View Answer All A., B. and C.

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