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 ?