Refractory Technology Natural silica Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes All of these Mainly contains quartz Is not stable at high temperature Transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes All of these Mainly contains quartz Is not stable at high temperature ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which one contains minimum percentage of SiO₂? Aluminous firebrick Semi-silica Sillimanite Firebrick Aluminous firebrick Semi-silica Sillimanite Firebrick ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fireclay bricks are not used in the Coke oven regenerators By-product coke oven walls Beehive coke oven Combustion chamber of B.F. stoves Coke oven regenerators By-product coke oven walls Beehive coke oven Combustion chamber of B.F. stoves ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Presence of MgO in alumino-silicate refractories __________ its refractoriness. Increases Either A or B; depends on its quantity Does not affect Lowers Increases Either A or B; depends on its quantity Does not affect Lowers ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Zircon refractories have All of these Low co-efficient of expansion High RUL (1600°C) and refractoriness (> 2000°C) High spalling resistance All of these Low co-efficient of expansion High RUL (1600°C) and refractoriness (> 2000°C) High spalling resistance ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Conversion of silica mineral to cristobalite is accompanied by reduction in its Neither A nor B Both A & B Volume Specific gravity Neither A nor B Both A & B Volume Specific gravity ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS