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 Cost Fusion point Thermal conductivity Electrical conductivity Cost Fusion point Thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling resistance of a refractory can not be increased by Making it denser Increasing its porosity Decreasing its thermal co-efficient of expansion Using a coarser grog during its manufacture Making it denser Increasing its porosity Decreasing its thermal co-efficient of expansion Using a coarser grog during its manufacture ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Bauxite calcining rotary kilns are lined with __________ bricks. Fireclay Corundum Carbon 85% alumina Fireclay Corundum Carbon 85% alumina ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Chrome magnesite bricks are Made by mixing 30% chromite and 70% periclase Having higher RUL than silica bricks Neutral in nature Acidic in nature Made by mixing 30% chromite and 70% periclase Having higher RUL than silica bricks Neutral in nature Acidic in nature ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology With increase in the alumina content in firebricks, its fusion point (refractoriness) Decreases Decreases linearly Increases Remains unchanged Decreases Decreases linearly Increases Remains unchanged ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Chromite refractories are Neutral refractory Acidic refractory Basic refractory Fired at a temperature of 600°C only Neutral refractory Acidic refractory Basic refractory Fired at a temperature of 600°C only ANSWER DOWNLOAD EXAMIANS APP
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