Chemical Engineering MCQs

Page No. 258

Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?


aNon-wetting characteristic


bHigh thermal conductivity


cHigh crushing strength


dNone of these



‘Super refractories’ are made from pure____________________?


aCarbides


bOxides


cBorides


dNitrides


View Answer Oxides

Magnesite chrome refractories____________________?


aHave better spalling resistance than chrome magnesite refractories


bHave very low thermal co-efficient of expansion


cAre not at all resistant to the corrosive action of iron oxide


dHave very low (50 kg/cm2) cold crushing strength (C.C.S.), and cannot be used in metalcase form



Use of higher percentage of lime for bonding silica bricks, reduces their__________________?


aStrength


bAbrasion resistance


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?


aLess shrinkage in heating, decreased apparent porosity & increased specific gravity


bHigh strength & thermal spalling resistance


cLess addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production


dAll A., B. and C.


View Answer All A., B. and C.

Pyrometric cone equivalent (PCE) of a refractory is the measure of its_________________?


aSpalling resistance


bFusion point


cResistance to slag penetration


dResistance to carbon monoxide attack


View Answer Fusion point

Ramming masses are used for____________________?


aObtaining monolithic working faces


bRepairing construction of various furnace parts


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?


aOxidising


bNeutral


cEither A. or B.


dNeither A. nor B.


View Answer Either A. or B.

10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the _____________ of Chromite?


aSpalling resistance


bRefractoriness


cCrushing strength


dResistance to slag


View Answer Spalling resistance

Which brick undergoes maximum shrinkage on drying ?


aTar bonded dolomite bricks


bFireclay bricks


cMagnesite bricks


dChromite bricks


View Answer Fireclay bricks

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