Fusion temperature of pure silica (SiO2) is __________ °C.
Crushing strength of a refractory
Ramming masses are used for
Which is the most stable crystalline form of silica at room temperature ?
Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?
Cold crushing strength of ordinary fireclay brick is aboutkg/cm2 . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm2 .
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
The linear thermal expansion of __________ bricks upto°C is very low of the order of ≤ 0.5 percent.
Silica refractories
In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C forhours.
Fireclay bricks is not used for lining the
__________ nozzles are used in continuous casting of steel,
Zirconia refractory
Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?
Fusion point of an acidic refractory material is
PCE value (Segar cone) of superduty refractories is more thanwhich is equivalent to a temperature of __________ °C.
Which is not an acidic refractory ?
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.
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
Addition of zircon to silica refractory brick improves its
silicon carbide refractories have very low
Pick out the wrong statement.
__________ is not a single oxiderefractory.
Which one contains maximum percentage of Al2O3 ?
Alumina-graphite bricks are used for lining the
Which is required in an insulating refractory ?
Which of the following is not an acidic refractory ?
Natural silica
Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to
Which is a neutral refractory ?
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