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.
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