Chemical Engineering MCQs

Page No. 269

Firing of refractory brick is done to __________________?


aDehydrate the dried refractory


bDevelop stable mineral forms in them


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


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


cHave lower thermal conductivity than fireclay bricks


dAll A., B. and C.



Which is not a basic refractory ?


aChrome magnesite


bMagnesite


cDolomite


dSilicon carbide


View Answer Silicon carbide

Which one contains maximum percentage of Al2O3 ?


aFirebrick


bSillimanite


cMagnesite


dAluminous firebrick


View Answer Sillimanite

RUL of refractories depends on the _____________________?


aChemical composition


bPhysical structure


cPresence of impurities like iron & alkali


dAll A., B. and C.


View Answer All A., B. and C.

Periclase is___________________?


aCrystalline form of MgO


bMgCO3


cMgCO3


dAmorphous magnesite



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


aAluminium phosphate


bWater


cLime


dPlaster of Paris


View Answer Water

Magnesite chrome bricks are used in the___________________?


aRoof lining of basic open hearth & other basic furnaces


bReheating furnaces


cSoaking pits


dAll A., B. and C.


View Answer All A., B. and C.

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


aVolume


bSpecific gravity


cBoth A. & B.


dNeither A. nor B.


View Answer Specific gravity

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


aRemoval of water of hydration


bVitrification


cDecrease in crushing strength


dDevelopment of stable mineral form



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