______________ bricks should not be used in oxidising atmosphere?
______________ bricks should not be used in oxidising atmosphere?
A. Tar dolomite
B. Carbon
C. Silica
D. Fireclay
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RUL of refractories depends on the _____________________?
RUL of refractories depends on the _____________________?A. Chemical composition
B. Physical structure
C. Presence of impurities like iron & alkali
D. All A., B. and C.Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?
Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?A. Bakelite impregnated or fused periclase
B. Silica
C. Semi-silica
D. FireclayWith decrease in porosity, the ______________ of the refractories decreases?
With decrease in porosity, the ______________ of the refractories decreases?A. Strength
B. Thermal conductivity
C. Spalling resistance
D. None of theseSilica bricks are never used for lining the____________________?
Silica bricks are never used for lining the____________________?A. Beehive coke ovens
B. By-product coke ovens
C. Dome of blast furnace stoves
D. Roof of open hearth furnaceMost Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?
Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?A. 80 and 20
B. 20 and 80
C. 50 and 50
D. 60 and 40Which one contains minimum percentage of SiO2 ?
Which one contains minimum percentage of SiO2 ?A. Firebrick
B. Sillimanite
C. Semi-silica
D. Aluminous firebrick