Refractory Technology Silica bricks have low spalling resistance below 600°C, due to its Very high thermal conductivity High co-efficient of expansion upto this temperature Low refractoriness High thermal diffusivity Very high thermal conductivity High co-efficient of expansion upto this temperature Low refractoriness High thermal diffusivity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Resistance to slag attack of a refractory Depends on the nature of slag & refractory Decreases at higher temperature All of these Decreases, if defective joints & cracks exist in the refractory Depends on the nature of slag & refractory Decreases at higher temperature All of these Decreases, if defective joints & cracks exist in the refractory ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Bottom of basic open hearth furnace are constructed of Silicon carbide bricks Dead burnt magnesite ramming mass Porous fireclay bricks Semi-silica bricks Silicon carbide bricks Dead burnt magnesite ramming mass Porous fireclay bricks Semi-silica bricks 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? Chemically prepared foam Saw dust Cork Sand Chemically prepared foam Saw dust Cork Sand ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Carborundum used for making crucibles for melting non-ferrous metals is chemically Silicon nitride Crystalline magnesia Zirconium sulphate Silicon carbide Silicon nitride Crystalline magnesia Zirconium sulphate Silicon carbide ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent. Fireclay Corundum Silica Magnesite Fireclay Corundum Silica Magnesite ANSWER DOWNLOAD EXAMIANS APP
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