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.Management Sciences
Category: Refractory Technology
Carbon refractories are exclusively used in the_________________?
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A. Hearth of blast furnace
B. Walls of coke oven
C. Regenerators of coke oven
D. Side wall of soaking pits
Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?
A. Silica
B. Fireclay
C. Magnesite
D. Zirconia
Cold crushing strength of fireclay bricks is about ______________ kgf/cm2?
A. 50-100
B. 100-150
C. 200-400
D. 500-1000
___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?
A. Porosity
B. RUL
C. Specific gravity
D. Thermal conductivity
Refractory materials are never used in the construction of _________________?
A. Segar cones
B. Orton cones
C. Pressure vessels
D. Ovens & retorts
Fireclay bricks are not used in the _________________?
A. Beehive coke oven
B. By-product coke oven walls
C. Combustion chamber of B.F. stoves
D. Coke oven regenerators
Carbon refractory blocks ___________________?
A. Are wetted by molten iron
B. Are used in the hearth of blast furnace
C. Are acidic in nature
D. All A., B. and C.
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except ?
A. Cost
B. Electrical conductivity
C. Thermal conductivity
D. Fusion point
With increase in the alumina content, the refractoriness of high alumina refractories_______________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease
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