Pick out the wrong statement.

SiO₂ percentage in firebrick is about

Spalling of a refractory means its

Roof of a basic open hearth furnace is lined with __________ bricks.

Chrome magnesite is not used in the

Graphite or carbon refractories

Magnesite chrome bricks are used in the

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.

Porosity is induced in insulating refractories by adding

High alumina refractories are used in the

Which of the following bricks has the most close values of RUL and PCE ?

'Spinel', a refractory mineral is chemically represented as

Chrome magnesite bricks are

Magnesite bricks have poor resistance to attack by __________ slag.

Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm² ) is __________ °C.

Zirconia refractories are not used in

Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the

Semi-silica bricks compared to silica bricks have

An ideal refractory should have high

Silica refractories are not used in

Tar dolomite bricks are used in the

__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

Bauxite calcining rotary kilns are lined with __________ bricks.

Carbon refractories

Pyrometric cone equivalent (PCE) of a refractory is the measure of its

Mixing of ground refractory material and water is done in a __________ mill.

Ganister is a source of the

Refractory materials are never used in the construction of

Segar cones are used for the determination of __________ of refractories.

Pick out the wrong statement.