Refractory Technology Carborundum used for making crucibles for melting non-ferrous metals is chemically Silicon carbide Crystalline magnesia Zirconium sulphate Silicon nitride Silicon carbide Crystalline magnesia Zirconium sulphate Silicon nitride ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Graphite or carbon refractories Should be used in neutral or reducing atmosphere Are not resistant to corrosion by slag Exhibit high shrinkage on thermal treatment Exihibit wetting characteristics Should be used in neutral or reducing atmosphere Are not resistant to corrosion by slag Exhibit high shrinkage on thermal treatment Exihibit wetting characteristics ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology __________ nozzles are used in continuous casting of steel, Beryllia Thoria Carborundum Zircon Beryllia Thoria Carborundum Zircon ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Carbon refractories Have extremely low thermal & electrical conductivities Are not attacked by slags, as they are not wetted by melts Do not resist temperature fluctuations Do not burn/oxidise, when exposed to air on heating Have extremely low thermal & electrical conductivities Are not attacked by slags, as they are not wetted by melts Do not resist temperature fluctuations Do not burn/oxidise, when exposed to air on heating ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fusion temperature of pure silica (SiO₂) is __________ °C. 2800 2570 1715 1350 2800 2570 1715 1350 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory Castables Mortars Cements None of these Castables Mortars Cements None of these ANSWER DOWNLOAD EXAMIANS APP
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