Refractory Technology SiO₂ percentage in firebrick is about 55-60 >94 35-40 80-85 55-60 >94 35-40 80-85 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Insulating refractories should have Both A & B High porosity Neither A nor B Low thermal conductivity Both A & B High porosity Neither A nor B Low thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Quartz is Stable form of silica upto 870°C Transformed to crystoballite on heating above 1470°C All of these Converted to tridymite on firing between 870 to 1470°C Stable form of silica upto 870°C Transformed to crystoballite on heating above 1470°C All of these Converted to tridymite on firing between 870 to 1470°C ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Silica bricks are never used for lining the By-product coke ovens Dome of blast furnace stoves Roof of open hearth furnace Beehive coke ovens By-product coke ovens Dome of blast furnace stoves Roof of open hearth furnace Beehive coke ovens ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Natural silica All of these Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes Is not stable at high temperature Mainly contains quartz All of these Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes Is not stable at high temperature Mainly contains quartz ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Carbon bricks are not used in the lining of the Combustion chamber of blast furnace stoves Electric furnaces Highly chemical resistant equipments Blast furnace hearth Combustion chamber of blast furnace stoves Electric furnaces Highly chemical resistant equipments Blast furnace hearth ANSWER DOWNLOAD EXAMIANS APP
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