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Refractory Technology

Refractory Technology
Roof of a basic open hearth furnace is lined with __________ bricks.

Dolomite
Fireclay
Silica
Magnesite

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Refractory Technology
SiO₂ percentage in firebrick is about

>94
35-40
55-60
80-85

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Refractory Technology
Which form of silica has the highest specific gravity?

Quartz
Cristobalite
All of these
Tridymite

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Refractory Technology
Basic bricks are not made of

Fireclay
Foresterite
Magnesite
Chromite

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Refractory Technology
Highest melting (m.p = 3070°C) oxide refractory is

Zirconia
Alumina
Magnesia
Thoria

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Refractory Technology
Crushing strength of a refractory

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

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