Chemical Engineering MCQs

Page No. 260

Which furnace consumes maximum refractory annually in an integrated steel plant ?


aSoaking pit


bBlast furnace


cL.D. converter


dCoke ovens


View Answer L.D. converter

Tar bonded dolomite bricks__________________?


aAre stored under controlled temperature & humidity to avoid hydration


bAre used in outer lining of L.D. converters


cHave poorer hydration resistance than pitch bonded bricks


dAll A., B. and C.


View Answer All A., B. and C.

Rate of slag attack on refractories increases with rise in temperature due to the___________________?


aDecreased viscosity of slag


bIncreased thermal conductivity of brick


cOxidising condition in the furnace


dNone of these



Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?


aPottery furnace


bGlass melting furnace


cCrucibles


dGas retorts


View Answer Gas retorts

Cold crushing strength of fireclay bricks is about ______________ kgf/cm2?


a50-100


b100-150


c200-400


d500-1000


View Answer 200-400

Tar dolomite bricks are used in the_________________?


aBasic open hearth furnace


bElectric furnaces


cBasic Bessemer converter


dAll A., B. and C.


View Answer All A., B. and C.

Which is a basic refractory ?


aFireclay


bSilica


cChrome magnesite


dNone of these


View Answer Chrome magnesite

Magnesite refractories have low resistance to___________________?


aAttack by basic slag


bAbrasion


cDisintegration on sudden change of temperature


dBoth B. and C.


View Answer Both B. and C.

Silica bricks have low spalling resistance below 600°C, due to its________________?


aVery high thermal conductivity


bHigh co-efficient of expansion upto this temperature


cHigh thermal diffusivity


dLow refractoriness



Periclase refractory contains mainly________________?


aCaO


bMgO


cAl2O3


dSiO2


View Answer MgO

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