Chemical Engineering MCQs

Page No. 256

Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?


aBakelite impregnated or fused periclase


bSilica


cSemi-silica


dFireclay



Colour of fireclay bricks is_________________?


aLight buff to reddish buff


bYellow


cBlack


dNone of these



Crushing strength of a refractory____________________?


aIncreases with rise in service temperature


bDecreases with rise in service temperature


cIs unaffected with change in service temperature


dDecreases with increase in porosity



The largest consumer of refractories is the _______________ industry?


aCement


bMetallurgical


cFertiliser


dPower


View Answer Metallurgical

The highest melting pure oxide (m.p. > 3000°C)is___________________?


aThoria


bAlumina


cBeryllia


dZirconia


View Answer Thoria

Zirconia refractories are not used in_____________________?


aMaking sheaths for thermocouple


bLining high temperature ceramic kilns


cFurnaces subjected to fluctuating temperature


dHigh frequency induction furnaces in the form of inductors



Dolomite bricks have good resistance to attack by_____________________?


aMolten steel


bIron oxide


cLime slag


dNone of these


View Answer Molten steel

Fireclay refractories have __________________?


aLow co-efficient of thermal expansion


bPoor thermal spalling resistance


cTendency to expand unduly high during firing


dVery high cost



Spray test determines the _____________ of refractories?


aResistance to slag penetration


bResistance to CO attack


cRUL


dPermanent linear change



PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?


a1520


b1630


c1670


d1730


View Answer 1730

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