91. Porosity of fireclay refractories is __________ percent.
92. Cold crushing strength of a refractory does not depend upon its
93. Vacuum steel degassing units are lined with
94. Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called
95. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves?
96. Thermal conductivity of refractory bricks
97. Thermal spalling mainly occurs during __________ of furnaces.
98. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
99. Which is the stable form of silica below 870°C ?
100. Which is the stable form of silica upto 1470°C ?
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