Refractory Technology An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture? Chemically prepared foam Cork Sand Saw dust Chemically prepared foam Cork Sand Saw dust ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology The main raw material for manufacture of silicon carbide refractories is Periclase Carborundum Bauxite Corrundum Periclase Carborundum Bauxite Corrundum ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling tendency of refractories is reduced by increasing its Thermal conductivity Specific gravity Strength Porosity Thermal conductivity Specific gravity Strength Porosity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks. Bakelite impregnated or fused periclase Semi-silica Silica Fireclay Bakelite impregnated or fused periclase Semi-silica Silica Fireclay ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is not a natural insulating material? Vermiculite Asbestos Diatomaceous earth/kieselgur None of these Vermiculite Asbestos Diatomaceous earth/kieselgur None of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to CO attack Thermal spalling Fusion under load Slag attack CO attack Thermal spalling Fusion under load Slag attack ANSWER DOWNLOAD EXAMIANS APP
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