A. Silica
B. Periclase
C. Lime
D. None of these
Related Mcqs:
- Bauxite calcining rotary kilns are lined with ________________ bricks?
A. Fireclay
B. Carbon
C. 85% alumina
D. Corundum - An ideal refractory should have high__________________?
A. Spalling rate
B. Fusion point
C. Shrinkage ability
D. None of these - Which one contains maximum percentage of Al2O3 ?
A. Firebrick
B. Sillimanite
C. Magnesite
D. Aluminous firebrick - Which of the following impurities reduces the refractoriness of magnesite bricks ?
A. Al2O3
B. CaO
C. SiO2
D. All A., B. & C. - Insulating refractories should have_______________?
A. High porosity
B. Low thermal conductivity
C. Both A. and B.
D. Neither A. not B. - Quartz is___________________?
A. Stable form of silica upto 870°C
B. Converted to Tridymite on firing between 870 to 1470°C
C. Transformed to Cristobalite on heating above 1470°C
D. All A., B. and C. - Magnesite refractories are used for the construction of those furnaces, which are________________?
A. Not required to resist the corrosive action of basic slag
B. Not subjected to fluctuation in temperature
C. Used for raising & maintaining high temperature
D. Both B. and C. - 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 - Use of higher percentage of lime for bonding silica bricks, reduces their__________________?
A. Strength
B. Abrasion resistance
C. Both A. & B.
D. Neither A. nor B. - Which is not a natural insulating material ?
A. Diatomaceous earth/kieselgur
B. Asbestos
C. Vermiculite
D. None of these
