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Refractory Technology

Refractory Technology
Which of the following is not a neutral refractory?

Chromite
Magnesite
Graphite
Silicon carbide

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Refractory Technology
Grog addition in fireclay during brick manufacture is done to

Enhance the strength of fired refractories
Reduce its shrinkage on heating
All of these
Impart greater spalling resistance

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Refractory Technology
The highest melting pure oxide (m.p. > 3000°C) is

Zirconia
Thoria
Beryllia
Alumina

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Refractory Technology
High alumina refractory compared to fireclay bricks have

Less resistance to slag attack
Low refractoriness
High resistance to thermal shock and creep
Less load bearing capacity

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Refractory Technology
Refractory castables are used for

All of these
Producing monolithic linings
Patch work
Minimising the number of joints in the structure

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Refractory Technology
In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

1000
1600
2000
700

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