Chemical Engineering MCQs

Page No. 269

Firing of refractory brick is done to __________________?


aDehydrate the dried refractory

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bDevelop stable mineral forms in them

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cForm ceramic bonds necessary for development of high crushing strength in the finished product

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Silica refractories__________________?


acrack when subjected to sudden change of temperature

✓


bCannot be used in the dome of hot blast stoves

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cHave lower thermal conductivity than fireclay bricks

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dAll A., B. and C.

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Which is not a basic refractory ?


aChrome magnesite

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bMagnesite

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cDolomite

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dSilicon carbide

✓


View Answer Silicon carbide

Which one contains maximum percentage of Al2O3 ?


aFirebrick

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bSillimanite

✓


cMagnesite

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dAluminous firebrick

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View Answer Sillimanite

RUL of refractories depends on the _____________________?


aChemical composition

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bPhysical structure

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cPresence of impurities like iron & alkali

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Periclase is___________________?


aCrystalline form of MgO

✓


bMgCO3

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cMgCO3

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dAmorphous magnesite

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Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material ?


aAluminium phosphate

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bWater

✓


cLime

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dPlaster of Paris

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View Answer Water

Magnesite chrome bricks are used in the___________________?


aRoof lining of basic open hearth & other basic furnaces

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bReheating furnaces

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cSoaking pits

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dAll A., B. and C.

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View Answer All A., B. and C.

Conversion of silica mineral to Cristobalite is accompanied by reduction in its ____________________?


aVolume

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bSpecific gravity

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Specific gravity

Which of the following does not occur during firing/burning of refractories ?


aRemoval of water of hydration

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bVitrification

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cDecrease in crushing strength

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dDevelopment of stable mineral form

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