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Refractory Technology

Refractory Technology
Roof of a basic electric furnace is made of __________ bricks.

Silica
None of these
Chromite
Superduty fireclay

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Refractory Technology
High refractorinness of refractory bricks means, that it has a

Low spalling resistance
Low porosity
High resistance to fusion
High spalling resistance

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Refractory Technology
Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.

70
570
270
770

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Refractory Technology
Sillimanite is a __________ refractory.

Insulating
High alumina
Basic
Neutral

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Refractory Technology
Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

2700
2200
1800
2400

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

Chrome magnesite
Fireclay
Silica
Zirconia

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