Refractory Technology Zircon refractories have High RUL (1600°C) and refractoriness (> 2000°C) All of these Low co-efficient of expansion High spalling resistance High RUL (1600°C) and refractoriness (> 2000°C) All of these Low co-efficient of expansion High spalling resistance ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which brick undergoes maximum shrinkage on drying? Chromite bricks Magnesite bricks Fireclay bricks Tar bonded dolomite bricks Chromite bricks Magnesite bricks Fireclay bricks Tar bonded dolomite bricks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology SiO₂ percentage in firebrick is about 35-40 80-85 55-60 >94 35-40 80-85 55-60 >94 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fireclay refractories Are not resistant to the action of basic slags Shrink during firing All of these Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc Are not resistant to the action of basic slags Shrink during firing All of these Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc 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. 70 270 570 770 70 270 570 770 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Dolomite bricks have good resistance to attack by Lime slag Molten steel None of these Iron oxide Lime slag Molten steel None of these Iron oxide ANSWER DOWNLOAD EXAMIANS APP
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