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Refractory Technology

Refractory Technology
PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.

1630
1520
1730
1670

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

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

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Refractory Technology
SiO₂ percentage in firebrick is about

55-60
>94
80-85
35-40

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Refractory Technology
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its

Non-wetting characteristic
None of these
High thermal conductivity
High crushing strength

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Refractory Technology
Ramming masses are used for

Neither A nor B
Both A & B
Obtaining monolithic working faces
Repairing construction of various furnace parts

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Refractory Technology
Rate of slag attack on refractories increases with rise in temperature due to the

Increased thermal conductivity of brick
Oxidising condition in the furnace
Decreased viscosity of slag
None of these

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