Refractory Technology With increase in the alumina content in firebricks, its fusion point (refractoriness) Remains unchanged Decreases Increases Decreases linearly Remains unchanged Decreases Increases Decreases linearly ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage? Magnesite bricks Fireclay bricks Tar bonded dolomite bricks Mullite bricks Magnesite bricks Fireclay bricks Tar bonded dolomite bricks Mullite bricks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology SiO₂ percentage in firebrick is about 55-60 35-40 80-85 >94 55-60 35-40 80-85 >94 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling of a refractory means its Softening Resistance to chemical action of gases and molten fluxes Resistancce to compressive loads Fracture due to uneven expansion at high temperature Softening Resistance to chemical action of gases and molten fluxes Resistancce to compressive loads Fracture due to uneven expansion at high temperature ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Quartz is Stable form of silica upto 870°C All of these Transformed to crystoballite on heating above 1470°C Converted to tridymite on firing between 870 to 1470°C Stable form of silica upto 870°C All of these Transformed to crystoballite on heating above 1470°C Converted to tridymite on firing between 870 to 1470°C ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Addition of zircon to silica refractory brick improves its Neither A nor B Resistance to slag attack Crushing strength Neither A nor B Neither A nor B Resistance to slag attack Crushing strength Neither A nor B ANSWER DOWNLOAD EXAMIANS APP
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