Related Questions

Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Si percentage in silica refractories used in the walls of coke oven is about
A 45
B 60
C 80
D 95
With increase in the density of silica refractories, its
A Resistance to slag attack increases
B Spalling resistance reduces
C Both A & B
D Neither A nor B
Silica refractories
A Crack when subjected to sudden change of temperature
B Can not be used in the dome of hot blast stoves
C Have lower thermal conductivity than fireclay bricks
D All of the above
Semi-silica bricks compared to silica bricks have
A Less fusion point
B Better spalling resistance
C Both A & B
D Neither A nor B
Magnesite refractories are generally not used in the
A Electric furnace walls
B Steel melting furnace
C Open hearth furnace
D Burning zone of cement kilns
Zirconia refractories are not used in
A Making sheaths for thermocouple
B Lining high temperature ceramic kilns
C Furnaces subjected to fluctuating temperature
D High frequency induction furnaces in the form of inductors
Silicon carbide refractories are used in the
A Muffle furnace
B Zinc smelting furnace
C Ceramic recuperators
D All of the above
Carbon refractories are exclusively used in the
A Hearth of blast furnace
B Walls of coke oven
C Regenerators of coke oven
D Side wall of soaking pits
High alumina refractories are used in the
A Dome of blast furnace stoves
B Electric arc furnace roof
C Glass melting furnaces
D All of the above

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