Refractory Technology Which is the stable form of silica between 1470°C and the melting point 1713°C ? Cristobalite Tridymite Quartz None of these Cristobalite Tridymite Quartz None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C. 1730 1670 1520 1630 1730 1670 1520 1630 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Segar cones are used for the determination of __________ of refractories. Softening temperature Electrical conductivity Resistance to slag attack Spalling resistance Softening temperature Electrical conductivity Resistance to slag attack Spalling resistance ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Chromite refractories are used in Neither A nor B Bottom of soaking pits Between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other Both A & B Neither A nor B Bottom of soaking pits Between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other Both A & B ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except Electrical conductivity Thermal conductivity Fusion point Cost Electrical conductivity Thermal conductivity Fusion point Cost ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Maximum alumina content in high alumina refractory can be as high as __________ percent. 30 70 50 90 30 70 50 90 ANSWER DOWNLOAD EXAMIANS APP
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