Permeability of bricks is a measure of the

Basic bricks are not made of

Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.

Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.

Which of the following does not occur during firing/burning of refractories ?

Spalling resistance of a refractory can not be increased by

'Super refractories' are made from pure

Insulating refractories should have

Thermal conductivity of refractory bricks

Thermal spalling mainly occurs during __________ of furnaces.

With increase in the density of silica refractories, its

With increase in the alumina content in firebricks, its fusion point (refractoriness)

Addition of grog in fireclay brick during its manufacture is advantageous, because it results in

High alumina refractory compared to fireclay bricks have

Silicon carbide refractories are used in the

Fireclay refractories have

Chromite refractories are

Dolomite bricks have good resistance to attack by

Magnesite chrome refractories

Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.

Fireclay refractories

Refractory bricks with lower permeability is produced by using

Refractory bricks having lower porosity have