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.
Refractory Technology
Refractory Technology
A. Beehive coke oven
B. By-product coke oven walls
C. Combustion chamber of B.F. stoves
D. Coke oven regenerators
A. Increases
B. Lowers
C. Does not affect
D. Either A. or B.; depends on its quantity
A. 3Al2O3.2SiO2
B. Al2O3
C. ZrSO4
D. ThO2
A. Fusion point
B. Spalling resistance
C. Slag penetration resistance
D. Refractoriness under load (RUL)
A. 30
B. 50
C. 70
D. 90
A. 5
B. 20
C. 40
D. 55
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.
A. Cost
B. Electrical conductivity
C. Thermal conductivity
D. Fusion point
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease