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Refractory Technology

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

Alumina
Zirconia
Magnesia
Thoria

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Refractory Technology
Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² .

65
450
250
150

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Refractory Technology
Which is the stable form of silica upto 1470°C ?

Cristobalite
None of these
Tridymite
Quartz

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Refractory Technology
SiO₂ percentage in firebrick is about

35-40
>94
80-85
55-60

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Refractory Technology
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its

High thermal conductivity
High crushing strength
None of these
Non-wetting characteristic

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Refractory Technology
Refractory materials are never used in the construction of

Orton cones
Segar cones
Pressure vessels
Ovens & retorts

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