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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
Electrical resistor bars are made of

Graphite
Silicon carbide
Zirconia
Alumina

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Refractory Technology
Magnesite refractories are generally not used in the

Open hearth furnace
Burning zone of cement kilns
Steel melting furnace
Electric furnace walls

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Refractory Technology
Silica bricks have low spalling resistance below 600°C, due to its

High thermal diffusivity
Very high thermal conductivity
High co-efficient of expansion upto this temperature
Low refractoriness

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Refractory Technology
High thermal conductivity of a refractory material is not important, when it is to be used in the

Blast furnace
Muffle furnace
Recuperators
Coke oven regenarators

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Refractory Technology
Dolomite bricks have good resistance to attack by

Lime slag
Iron oxide
None of these
Molten steel

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