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 Fusion point Electrical conductivity Cost Thermal conductivity Fusion point Electrical conductivity Cost Thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Zirconia refractory Can not be used as an insulator Has poor electrical conductivity at high temperature Is produced from baddeleyite Does not react with basic slags Can not be used as an insulator Has poor electrical conductivity at high temperature Is produced from baddeleyite Does not react with basic slags ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves? High resistance to spalling High strength and density High refractoriness All of these High resistance to spalling High strength and density High refractoriness All of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is not a basic refractory? Silicon carbide Magnesite Dolomite Chrome magnesite Silicon carbide Magnesite Dolomite Chrome magnesite ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the Neither A nor B Corrosion by layer of slag Both A & B Washing action of metal Neither A nor B Corrosion by layer of slag Both A & B Washing action of metal ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Quartz is Converted to tridymite on firing between 870 to 1470°C All of these Stable form of silica upto 870°C Transformed to crystoballite on heating above 1470°C Converted to tridymite on firing between 870 to 1470°C All of these Stable form of silica upto 870°C Transformed to crystoballite on heating above 1470°C ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS