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
Silica refractories are not used in
A Coke oven walls
B Beehive coke ovens
C Dome and upper portion of B.F. stoves
D Open hearth furnace roof
Si percentage in silica refractories used in the walls of coke oven is about
A 45
B 60
C 80
D 95
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
With increase in the alumina content, the refractoriness of high alumina refractories
A Increases
B Decreases
C Remains same
D May increase or decrease
Cold crushing strength of refractories depends upon its
A Composition
B Texture
C Firing temperature
D All of the above
Presence of MgO in alumino-silicate refractories __________ its refractoriness.
A Increases
B Lowers
C Does not affect
D Either A or B; depends on its quantity
Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
A 1800
B 2200
C 2400
D 2700
Spalling tendency of refractories is reduced by increasing its
A Porosity
B Specific gravity
C Thermal conductivity
D Strength

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