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Refractory Technology

Refractory Technology
Thermal diffusivity of a refractory brick is high, when its __________ is high.

Density
Thermal conductivity
Specific heat
None of these

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Refractory Technology
Outer combustion chamber of blast furnace stove is lined with __________ bricks.

Fireclay
Silica
Zirconia
Chrome magnesite

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Refractory Technology
Bottom of basic open hearth furnace are constructed of

Semi-silica bricks
Porous fireclay bricks
Dead burnt magnesite ramming mass
Silicon carbide bricks

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Refractory Technology
Which of the following is not a neutral refractory?

Chromite
Magnesite
Silicon carbide
Graphite

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Refractory Technology
Presence of MgO in alumino-silicate refractories __________ its refractoriness.

Either A or B; depends on its quantity
Increases
Lowers
Does not affect

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

Corrosion by layer of slag
Washing action of metal
Neither A nor B
Both A & B

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