Refractory Technology Semi-silica bricks compared to silica bricks have Better spalling resistance Neither A nor B Both A & B Less fusion point Better spalling resistance Neither A nor B Both A & B Less fusion point ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent. 90 80 55 70 90 80 55 70 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Carbon refractories Are not attacked by slags, as they are not wetted by melts Do not resist temperature fluctuations Have extremely low thermal & electrical conductivities Do not burn/oxidise, when exposed to air on heating Are not attacked by slags, as they are not wetted by melts Do not resist temperature fluctuations Have extremely low thermal & electrical conductivities Do not burn/oxidise, when exposed to air on heating ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractoriness/fusion points of 'superduty' refractories is __________ °C. 1520-1630 > 2000 > 1730 1630-1670 1520-1630 > 2000 > 1730 1630-1670 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fusion point of an acidic refractory material is Reduced by the addition of basic oxides Increased by the addition of basic oxides Not affected by the addition of basic oxides Not affected by the addition of basic oxides Reduced by the addition of basic oxides Increased by the addition of basic oxides Not affected by the addition of basic oxides Not affected by the addition of basic oxides ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is not a basic refractory? Magnesite Chrome magnesite Dolomite Silicon carbide Magnesite Chrome magnesite Dolomite Silicon carbide ANSWER DOWNLOAD EXAMIANS APP
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