A. Cristobalite
B. Tridymite
C. Quartz
D. None of these
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Related Mcqs:
- Which is the stable form of silica upto 1470°C ?
- A. Quartz B. Cristobalite C. Tridymite D. None of these...
- Which is the most stable crystalline form of silica at room temperature ?
- A. Quartz B. Cristobalite C. Tridymite D. None of these...
- Which is the stable form of silica below 870°C ?
- A. Tridymite B. Cristobalite C. Quartz D. None of these...
- Semi-silica bricks compared to silica bricks have_______________?
- A. Less fusion point B. Better spalling resistance C. Both A. and B. D. Neither A. not B....
- Which form of silica has the highest specific gravity ?
- A. Quartz B. Cristobalite C. Tridymite D. All have the same specific gravity...
- With increase in the density of silica refractories, its_______________?
- A. Resistance to slag attack increases B. Spalling resistance reduces C. Both A. and B. D. Neither A. nor B....
- Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of _____________ °C?
- A. 1380 B. 1520 C. 1710 D. 1915...
- Silica refractories are not used in _________________?
- A. Coke oven walls B. Beehive coke ovens C. Dome and upper portion of B.F. stoves D. Open hearth furnace roof...
- Porosity of silica bricks varies from ______________ percent?
- A. 5 to 10 B. 20 to 30 C. 45 to 60 D. 60 to 75...
- Silica bricks have low spalling resistance below 600°C, due to its________________?
- A. Very high thermal conductivity B. High co-efficient of expansion upto this temperature C. High thermal diffusivity D. Low refractoriness...
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