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
82. SiO2 percentage in firebrick is about
83. Refractories are dried in the
84. Refractoriness/fusion points of 'superduty' refractories is __________ °C.
85. Refractoriness/fusion points of 'superduty' refractories is __________ °C.
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?
87. Which of the following does not occur during firing/burning of refractories?
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.
90. Bottom of basic open hearth furnace are constructed of
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