Chemical Engineering MCQs

Page No. 254

Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to__________________?


aThermal spalling


bSlag attack


cFusion under load


dCO attack


View Answer Thermal spalling

Addition of zircon to silica refractory brick improves its_____________________?


aCrushing strength


bResistance to slag attack


cBoth A. and B.


dNeither A. nor B.



Bottom of basic open hearth furnace are constructed of__________________?


aDead burnt magnesite ramming mass


bPorous fireclay bricks


cSemi-silica bricks


dSilicon carbide bricks



Fusion temperature of pure silica (SiO2) is _______________ °C?


a1350


b1715


c2570


d2800


View Answer 1715

Porosity of fireclay refractories is _______________ percent?


a5-10


b10-25


c25-35


d35-50


View Answer 10-25

High alumina refractory compared to fireclay bricks have____________________?


aLess load bearing capacity


bLess resistance to slag attack


cLow refractoriness


dHigh resistance to thermal shock and creep



Mullite is chemically represented by_________________?


aAl2O3. 2SiO2


b3Al2O3. 2SiO2


cAl2O3. SiO2


d2Al2O3. 3SiO2


View Answer 3Al2O3. 2SiO2

Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?


a55


b70


c80


d90


View Answer 90

Which one contains minimum percentage of SiO2 ?


aFirebrick


bSillimanite


cSemi-silica


dAluminous firebrick


View Answer Sillimanite

___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?


aPorosity


bRUL


cSpecific gravity


dThermal conductivity


View Answer RUL

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