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

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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

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bNeutral

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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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