Refractory Technology Which of the following bricks should not be used, if the furnace is to be used intermit-tantly? Silica bricks Sillimanite Silicon carbide bricks Firebricks Silica bricks Sillimanite Silicon carbide bricks Firebricks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology An indication of degree of firing in silica brick is its Fusion point Specific gravity None of these RUL Fusion point Specific gravity None of these RUL ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which is required in an insulating refractory? Neither A nor B Low porosity Both A & B High thermal conductivity Neither A nor B Low porosity Both A & B High thermal conductivity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Addition of grog in fireclay brick during its manufacture is advantageous, because it results in 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 High strength & thermal spalling resistance ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling of a refractory means its Resistance to chemical action of gases and molten fluxes Resistancce to compressive loads Softening Fracture due to uneven expansion at high temperature Resistance to chemical action of gases and molten fluxes Resistancce to compressive loads Softening Fracture due to uneven expansion at high temperature ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Thermal diffusivity of a refractory brick is high, when its __________ is high. Thermal conductivity Specific heat None of these Density Thermal conductivity Specific heat None of these Density ANSWER DOWNLOAD EXAMIANS APP
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