Related Questions

Mullite is chemically represented by
A Al2O3.2SiO2
B 3Al2O3.2SiO2
C Al2O3.SiO2
D 2Al2O3.3SiO2
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Hot face insulating linings of high purity alumina fused mullite are used, where
A Very high temperatures are involved
B Highly reducing conditions are involved
C Presence of iron or silica is harmful
D All of the above
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
A Washing action of metal
B Corrosion by layer of slag
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
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
With increasing alumina content, the fusion point of high alumina refractories
A Increases
B Decreases
C Remains constant
D May increase or decrease ; depends on its alumina content
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
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
A Fireclay
B Carborundum
C Graphite
D Chromite

Next steps