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
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
Carbon refractories have very high
A Wetting characteristics
B Refractoriness
C Thermal conductivity
D Both B and C
Graphite or carbon refractories
A Exihibit wetting characteristics
B Should be used in neutral or reducing atmosphere
C Exhibit high shrinkage on thermal treatment
D Are not resistant to corrosion by slag
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
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
Cold crushing strength of refractories depends upon its
A Composition
B Texture
C Firing temperature
D All of the above

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