Refractory Technology Fusion point of an acidic refractory material is 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 Reduced by the addition of basic oxides Increased by the addition of basic oxides ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology With increase in the alumina content in firebricks, its fusion point (refractoriness) Increases Decreases Decreases linearly Remains unchanged Increases Decreases Decreases linearly Remains unchanged ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C. 770 570 70 270 770 570 70 270 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Carbon refractories Are not attacked by slags, as they are not wetted by melts Do not burn/oxidise, when exposed to air on heating Have extremely low thermal & electrical conductivities Do not resist temperature fluctuations Are not attacked by slags, as they are not wetted by melts Do not burn/oxidise, when exposed to air on heating Have extremely low thermal & electrical conductivities Do not resist temperature fluctuations ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Ferromagnetic ceramic material is not used in the Magnetic switches Thermal insulation Television sets Transformers Magnetic switches Thermal insulation Television sets Transformers ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² . 65 150 250 450 65 150 250 450 ANSWER DOWNLOAD EXAMIANS APP
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