Refractory Technology Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory None of these Cements Mortars Castables None of these Cements Mortars Castables ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fusion temperature of pure silica (SiO₂) is __________ °C. 1715 2800 1350 2570 1715 2800 1350 2570 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology With decrease in porosity, the __________ of the refractories decreases. Strength None of these Thermal conductivity Spalling resistance Strength None of these Thermal conductivity Spalling resistance 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 Fusion point Thermal conductivity Cost Electrical conductivity Fusion point Thermal conductivity Cost ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Hot face insulating linings of high purity alumina fused mullite are used, where Highly reducing conditions are involved Very high temperatures are involved Presence of iron or silica is harmful All of these Highly reducing conditions are involved Very high temperatures are involved Presence of iron or silica is harmful All of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Insulating refractories should have High porosity Low thermal conductivity Both A & B Neither A nor B High porosity Low thermal conductivity Both A & B Neither A nor B ANSWER DOWNLOAD EXAMIANS APP
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