A. Spalling resistance
B. Refractoriness
C. Refractoriness under load (RUL)
D. None of these
0
Refractoriness/fusion points of ‘Superduty’ refractories is _____________ °C?
0
With increase in the porosity, thermal spalling resistance of fireclay brick_______________?
A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000
0
Quartz is__________________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease
0
Pure oxide refractories are generally monocrystalline in nature and are self bonded ______________ bricks are generally used as moderator in nuclear reactors?
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.
0
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of ________________?
A. Beryllia
B. Carborundum
C. Corundum
D. Thoria
0
Refractory bricks having lower porosity have _____________________?
A. Fireclay
B. Silicon carbide
C. Corundum
D. Siliceous fireclay
0
Silica bricks are never used for lining the_________________?
A. High insulating properties
B. Low heat capacity
C. Low thermal conductivity
D. Greater strength
0
Fireclay refractories___________________?
A. Beehive coke ovens
B. By-product coke ovens
C. Dome of blast furnace stoves
D. Roof of open hearth furnace