Refractory Technology Crushing strength of a refractory Decreases with rise in service temperature Increases with rise in service temperature Decreases with increase in porosity Is unaffected with change in service temperature Decreases with rise in service temperature Increases with rise in service temperature Decreases with increase in porosity Is unaffected with change in service temperature ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Silica refractories Crack when subjected to sudden change of temperature Can not be used in the dome of hot blast stoves All of these Have lower thermal conductivity than fireclay bricks Crack when subjected to sudden change of temperature Can not be used in the dome of hot blast stoves All of these Have lower thermal conductivity than fireclay bricks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Silica bricks have low spalling resistance below 600°C, due to its 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 Very high thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology With increasing alumina content, the fusion point of high alumina refractories Remains constant Decreases May increase or decrease ; depends on its alumina content Increases Remains constant Decreases May increase or decrease ; depends on its alumina content Increases ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Addition of grog in fireclay brick during its manufacture is advantageous, because it results in Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production Less shrinkage in heating, decreased apparent porosity & increased specific gravity All of these High strength & thermal spalling resistance Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production Less shrinkage in heating, decreased apparent porosity & increased specific gravity All of these High strength & thermal spalling resistance ANSWER DOWNLOAD EXAMIANS APP
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