Refractory Technology Quartz is All of these Stable form of silica upto 870°C Converted to tridymite on firing between 870 to 1470°C Transformed to crystoballite on heating above 1470°C All of these Stable form of silica upto 870°C Converted to tridymite on firing between 870 to 1470°C Transformed to crystoballite on heating above 1470°C ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fusion temperature of pure silica (SiO₂) is __________ °C. 2570 1350 2800 1715 2570 1350 2800 1715 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of Muffles for muffle furnaces Insulating bricks Crucibles used for melting of high purity metals Segar cones Muffles for muffle furnaces Insulating bricks Crucibles used for melting of high purity metals Segar cones ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Sillimanite is a __________ refractory. Insulating Neutral Basic High alumina Insulating Neutral Basic High alumina ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is required in an insulating refractory? Low porosity High thermal conductivity Neither A nor B Both A & B Low porosity High thermal conductivity Neither A nor B Both A & B ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Si percentage in silica refractories used in the walls of coke oven is about 95 45 80 60 95 45 80 60 ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS