Refractory Technology Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks. Magnesite Fireclay Zirconia Silica Magnesite Fireclay Zirconia Silica ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology What is Thoria? Thoria Has high resistance to basic slags Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock All of these Which is expensive & radioactive, is used in crucibles for melting high purity metals Thoria Has high resistance to basic slags Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock All of these Which is expensive & radioactive, is used in crucibles for melting high purity metals ANSWER DOWNLOAD EXAMIANS APP
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? Sand Cork Saw dust Chemically prepared foam Sand Cork Saw dust Chemically prepared foam ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors. Thoria Beryllia Carborundum Corundum Thoria Beryllia Carborundum Corundum ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Firing temperature of magnesite bricks is about __________ °C. 1600-1800 800-1000 1000-1200 2400-2600 1600-1800 800-1000 1000-1200 2400-2600 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Fireclay refractories Are not resistant to the action of basic slags Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc All of these Shrink during firing Are not resistant to the action of basic slags Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc All of these Shrink during firing ANSWER DOWNLOAD EXAMIANS APP
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