Which furnace consumes maximum refractory annually in an integrated steel plant ?
Use of higher percentage of lime for bonding silica bricks, reduces their
Magnesite refractories have low resistance to
Highest melting (m.p = 3070°C) oxide refractory is
Maximum apparent porosity of magnesite bricks is about __________ percent.
Which brick undergoes maximum shrinkage on drying ?
The main raw material for manufacture of silicon carbide refractories is
Fireclay bricks are used in the
Lower part of hot metal mixer are lined with __________ bricks.
Grog addition in fireclay during brick manufacture is done to
Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?
Chrome magnesite brick is not used for lining the
Which one contains minimum percentage of SiO2?
Dilatometer is used for the determination of __________ of refractories.
Which is the stable form of silica upto 1470°C ?
Chromite refractories are used in
Carbon refractories have very high
Pick out the wrong statement.
The maximum linear expansion of silica bricks during firing is about __________ percent.
With decrease in porosity, the __________ of the refractories decreases.
Hot face insulating linings of high purity alumina fused mullite are used, where
Which of the following has the lowest electrical resistivity ?
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
Silica bricks have low spalling resistance below 600°C, due to its
Thermal diffusivity of a refractory brick is high, when its __________ is high.
Which one expands on heating ?
High porosity refractory bricks have
Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.
Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ °C.
Panel test determines the __________ of refractories.
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