Refractory Technology Quartz is Transformed to crystoballite on heating above 1470°C Converted to tridymite on firing between 870 to 1470°C All of these Stable form of silica upto 870°C Transformed to crystoballite on heating above 1470°C Converted to tridymite on firing between 870 to 1470°C All of these Stable form of silica upto 870°C ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which one expands on heating? Silica bricks Neither A nor B Fireclay bricks Both A & B Silica bricks Neither A nor B Fireclay bricks Both A & B ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Magnesite bricks are used in those parts of furnaces, which are Required to resist corrosive basic slag Subjected to temperature fluctuation Subjected to high load None of these Required to resist corrosive basic slag Subjected to temperature fluctuation Subjected to high load None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite. Spalling resistance Refractoriness Resistance to slag Crushing strength Spalling resistance Refractoriness Resistance to slag Crushing strength ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Silica bricks are never used for lining the Roof of open hearth furnace By-product coke ovens Dome of blast furnace stoves Beehive coke ovens Roof of open hearth furnace By-product coke ovens Dome of blast furnace stoves Beehive coke ovens ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which of the following bricks should not be used, if the furnace is to be used intermit-tantly? Silica bricks Firebricks Sillimanite Silicon carbide bricks Silica bricks Firebricks Sillimanite Silicon carbide bricks ANSWER DOWNLOAD EXAMIANS APP
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