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Refractory Technology

Refractory Technology
Which is a neutral refractory?

Graphite
Magnesia
Magnesite chrome
Silica

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Refractory Technology
Bauxite calcining rotary kilns are lined with __________ bricks.

Fireclay
Corundum
Carbon
85% alumina

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

None of these
Quartz
Cristobalite
Tridymite

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Refractory Technology
With decrease in porosity, the __________ of the refractories decreases.

Spalling resistance
Thermal conductivity
Strength
None of these

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Refractory Technology
High thermal conductivity of a refractory material is not important, when it is to be used in the

Blast furnace
Muffle furnace
Coke oven regenarators
Recuperators

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Refractory Technology
Firing of refractory brick is done to

Form ceramic bonds necessary for development of high crushing strength in the finished product
Dehydrate the dried refractory
All of these
Develop stable mineral forms in them

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