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 Zircon refractories have Low co-efficient of expansion All of these High spalling resistance High RUL (1600°C) and refractoriness (> 2000°C) Low co-efficient of expansion All of these High spalling resistance High RUL (1600°C) and refractoriness (> 2000°C) ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent. 7-12 5-7 14-20 2-3 7-12 5-7 14-20 2-3 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Addition of grog in fireclay brick during its manufacture is advantageous, because it results in All of these Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production High strength & thermal spalling resistance Less shrinkage in heating, decreased apparent porosity & increased specific gravity All of these Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production High strength & thermal spalling resistance Less shrinkage in heating, decreased apparent porosity & increased specific gravity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology With increasing alumina content, the fusion point of high alumina refractories Decreases Increases Remains constant May increase or decrease ; depends on its alumina content Decreases Increases Remains constant May increase or decrease ; depends on its alumina content ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which of the following impurities reduces the refractoriness of magnesite bricks? CaO SiO₂ Al2O₃ All of these CaO SiO₂ Al2O₃ All of these ANSWER DOWNLOAD EXAMIANS APP
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