81. Conversion of silica mineral to cristobalite is accompanied by reduction in its
82. Cermets are
83. Which is not a basic refractory?
84. Chrome magnesite bricks are
85. Chromite refractories are
86. Refractory bricks having lower porosity have
87. Fireclay bricks is not used for lining the
88. Colour of fireclay bricks is
89. Semi-silica bricks compared to silica bricks have
90. Magnesite refractories have low resistance to
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