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Refractory Technology

Refractory Technology
SiO₂ percentage in firebrick is about

>94
55-60
35-40
80-85

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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
Silicon carbide bricks
Firebricks

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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
1800
2200
2400

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Refractory Technology
Spray test determines the __________ of refractories.

Permanent linear change
Resistance to slag penetration
Resistance to CO attack
RUL

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Refractory Technology
Crushing strength of a refractory

Increases with rise in service temperature
Is unaffected with change in service temperature
Decreases with increase in porosity
Decreases with rise in service temperature

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Refractory Technology
Alumina-graphite bricks are used for lining the

Both A & B
Neither A nor B
Continuous casting systems
Slide gate in teeming laddies

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