81.
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

86.
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?

88.
Rate of slag attack on refractories increases with rise in temperature due to the

89.
__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

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