Refractory Technology Fireclay refractories have Poor thermal spalling resistance Very high cost Low co-efficient of thermal expansion Tendency to expand unduly high during firing Poor thermal spalling resistance Very high cost Low co-efficient of thermal expansion Tendency to expand unduly high during firing ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which of the following has the lowest electrical resistivity? Fireclay Zircon Alumina Graphite Fireclay Zircon Alumina Graphite ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of Muffles for muffle furnaces Insulating bricks Segar cones Crucibles used for melting of high purity metals Muffles for muffle furnaces Insulating bricks Segar cones Crucibles used for melting of high purity metals ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology An indication of degree of firing in silica brick is its None of these Specific gravity RUL Fusion point None of these Specific gravity RUL Fusion point ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Periclase refractory contains mainly CaO SiO₂ MgO Al2O₃ CaO SiO₂ MgO Al2O₃ ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology High porosity refractory bricks have All of these Poor resistance to the peneration of molten slag, metal & flue gases Poor heat conductivity & low strength Better thermal spalling resistance All of these Poor resistance to the peneration of molten slag, metal & flue gases Poor heat conductivity & low strength Better thermal spalling resistance ANSWER DOWNLOAD EXAMIANS APP
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