Refractory Technology Which is the most stable crystalline form of silica at room temperature? Cristobalite Quartz Tridymite None of these Cristobalite Quartz Tridymite None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Carborundum used for making crucibles for melting non-ferrous metals is chemically Crystalline magnesia Silicon nitride Zirconium sulphate Silicon carbide Crystalline magnesia Silicon nitride Zirconium sulphate Silicon carbide ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology __________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold. Non-wetting characteristics High density High thermal conductivity Low porosity Non-wetting characteristics High density High thermal conductivity Low porosity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology The maximum linear expansion of silica bricks during firing is about __________ percent. 0.5 2 3.5 1 0.5 2 3.5 1 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractoriness/fusion points of 'superduty' refractories is __________ °C. 1630-1670 1520-1630 > 2000 > 1730 1630-1670 1520-1630 > 2000 > 1730 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Silica bricks have low spalling resistance below 600°C, due to its Low refractoriness High co-efficient of expansion upto this temperature Very high thermal conductivity High thermal diffusivity Low refractoriness High co-efficient of expansion upto this temperature Very high thermal conductivity High thermal diffusivity ANSWER DOWNLOAD EXAMIANS APP
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