Chemical Engineering MCQs

Page No. 260

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


aSoaking pit

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bBlast furnace

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cL.D. converter

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dCoke ovens

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View Answer L.D. converter

Tar bonded dolomite bricks__________________?


aAre stored under controlled temperature & humidity to avoid hydration

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bAre used in outer lining of L.D. converters

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cHave poorer hydration resistance than pitch bonded bricks

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dAll A., B. and C.

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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

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bIncreased thermal conductivity of brick

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cOxidising condition in the furnace

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dNone of these

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


aPottery furnace

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bGlass melting furnace

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cCrucibles

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dGas retorts

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View Answer Gas retorts

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


a50-100

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b100-150

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c200-400

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d500-1000

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View Answer 200-400

Tar dolomite bricks are used in the_________________?


aBasic open hearth furnace

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bElectric furnaces

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cBasic Bessemer converter

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dAll A., B. and C.

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View Answer All A., B. and C.

Which is a basic refractory ?


aFireclay

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bSilica

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cChrome magnesite

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dNone of these

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View Answer Chrome magnesite

Magnesite refractories have low resistance to___________________?


aAttack by basic slag

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bAbrasion

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cDisintegration on sudden change of temperature

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dBoth B. and C.

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View Answer Both B. and C.

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


aVery high thermal conductivity

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bHigh co-efficient of expansion upto this temperature

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cHigh thermal diffusivity

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dLow refractoriness

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Periclase refractory contains mainly________________?


aCaO

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bMgO

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cAl2O3

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dSiO2

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View Answer MgO

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