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
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
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
A 55
B 70
C 80
D 90
silicon carbide refractories have very low
A [

A. Refractoriness (

B. Thermal conductivity

B Resistance to thermal shock
C None of these
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
A Do not burn/oxidise, when exposed to air on heating
B Are not attacked by slags, as they are not wetted by melts
C Do not resist temperature fluctuations
D Have extremely low thermal & electrical conductivities
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
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
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
Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.
A 10
B 15
C 20
D 30

Next steps