Chemical Engineering MCQs

Page No. 270

Grog addition in fireclay during brick manufacture is done to_________________?


aReduce its shrinkage on heating

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bImpart greater spalling resistance

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cEnhance the strength of fired refractories

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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

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cHighly chemical resistant equipments

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dBlast furnace hearth

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


a10

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b100

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c500

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d1000

✓


View Answer 1000

Porosity is induced in insulating refractories by adding________________?


aPowdered naphthalene

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bAmmonium chloride/sulphate

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cCalcium phosphate

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dAll A., B. and C.

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View Answer All A., B. and C.

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


aSoftening temperature

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bSpalling resistance

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cElectrical conductivity

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dResistance to slag attack

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View Answer Softening temperature

Fusion point of an acidic refractory material is________________?


aIncreased by the addition of basic oxides

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bReduced by the addition of basic oxides

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cNot affected by the addition of basic oxides

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dAlways more than 2500°C

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An ideal refractory should have high__________________?


aSpalling rate

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bFusion point

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cShrinkage ability

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dNone of these

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View Answer Fusion point

Carbon refractories have very high __________________?


aWetting characteristics

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bRefractoriness

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cThermal conductivity

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dBoth B. and C.

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View Answer Both B. and C.

Zirconia refractory_________________?


aDoes not react with basic slags

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bIs produced from baddeleyite

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cCannot be used as an insulator

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dHas poor electrical conductivity at high temperature

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Graphite or carbon refractories______________________?


aExhibit wetting characteristics

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bShould be used in neutral or reducing atmosphere

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cExhibit high shrinkage on thermal treatment

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dAre not resistant to corrosion by slag

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