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Refractory Technology

Refractory Technology
Colour of fireclay bricks is

Yellow
Light buff to reddish buff
None of these
Black

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Refractory Technology
Which of the following impurities reduces the refractoriness of magnesite bricks?

Al2O₃
CaO
SiO₂
All of these

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Refractory Technology
Magnesite refractories are used for the construction of those furnaces, which are

Not subjected to fluctuation in temperature
Used for raising & maintaining high temperature
Both (b) and ©
Not required to resist the corrosive action of basic slag

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Refractory Technology
Refractories are dried in the

Rotary kilns
Tunnel kilns
None of these
Sun

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Refractory Technology
Which of the following bricks should not be used, if the furnace is to be used intermit-tantly?

Sillimanite
Silica bricks
Firebricks
Silicon carbide bricks

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Refractory Technology
The maximum linear expansion of silica bricks during firing is about __________ percent.

0.5
3.5
2
1

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