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