A. Poor resistance to the penetration of molten slag, metal & flue gases
B. Poor heat conductivity & low strength
C. Better thermal spalling resistance
D. All A., B. and C.
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Related Mcqs:
- Refractory bricks having lower porosity have_________________________?
- A. High insulating properties B. Low heat capacity C. Low thermal conductivity D. Greater strength...
- High density refractory bricks have lower__________________?
- A. Spalling resistance B. Thermal conductivity C. Fusion point D. Slag penetration resistance...
- High refractoriness of refractory bricks means, that it has a________________?
- A. High spalling resistance B. Low spalling resistance C. High resistance to fusion D. Low porosity...
- High alumina refractory compared to fireclay bricks have____________________?
- A. Less load bearing capacity B. Less resistance to slag attack C. Low refractoriness D. High resistance to thermal shock and creep...
- Porosity of silica bricks varies from ______________ percent?
- A. 5 to 10 B. 20 to 30 C. 45 to 60 D. 60 to 75...
- Maximum apparent porosity of magnesite bricks is about _____________ percent?
- A. 8 B. 24 C. 44 D. 58...
- Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?
- A. Pottery furnace B. Glass melting furnace C. Crucibles D. Gas retorts...
- Hollow refractory bricks are made by___________________?
- A. Slip casting B. Hand moulding C. pressing/machine moulding D. Extrusion...
- Water content in ground refractory material to be shaped into bricks by hand moulding is about ______________ percent?
- A. 5 B. 20 C. 40 D. 55...
- Refractory bricks with lower permeability is produced by using __________________?
- A. Higher firing temperature B. Higher moulding pressure C. Finer grog size D. All A., B. and C....
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