Refractory Technology
Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.

Thoria
Corundum
Carborundum
Beryllia

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Refractory Technology
Thermal conductivity of refractory bricks

Decreases with decreases in porosity
Increases with decrease in porosity
Is independent of its porosity and is maximum for insulating bricks
Increases with the amount of air entrapped in pores

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