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Refractory Technology

Refractory Technology
Periclase is

Crystalline form of MgO
MgCO₃
ZrSO₄
Amorphous magnesite

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Refractory Technology
Carbon bricks are not used in the lining of the

Highly chemical resistant equipments
Blast furnace hearth
Combustion chamber of blast furnace stoves
Electric furnaces

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Refractory Technology
Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² .

65
150
450
250

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Refractory Technology
Bottom of basic open hearth furnace are constructed of

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

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Refractory Technology
Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?

Magnesite bricks
Fireclay bricks
Mullite bricks
Tar bonded dolomite bricks

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Refractory Technology
Which one contains minimum percentage of SiO₂?

Aluminous firebrick
Semi-silica
Firebrick
Sillimanite

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