Refractory Technology Spalling resistance of a refractory can not be increased by Making it denser Decreasing its thermal co-efficient of expansion Using a coarser grog during its manufacture Increasing its porosity Making it denser Decreasing its thermal co-efficient of expansion Using a coarser grog during its manufacture Increasing its porosity ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Carbon refractories are exclusively used in the Side wall of soaking pits Hearth of blast furnace Regenerators of coke oven Walls of coke oven Side wall of soaking pits Hearth of blast furnace Regenerators of coke oven Walls of coke oven ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Porosity is induced in insulating refractories by adding Ammonium chloride/sulphate Powdered naphthalene All of these Calcium phosphate Ammonium chloride/sulphate Powdered naphthalene All of these Calcium phosphate ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spray test determines the __________ of refractories. Resistance to CO attack RUL Permanent linear change Resistance to slag penetration Resistance to CO attack RUL Permanent linear change Resistance to slag penetration ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale. Chrome or magnesite Silica Lowduty fireclay Silicon carbide Chrome or magnesite Silica Lowduty fireclay Silicon carbide ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Addition of grog in fireclay brick during its manufacture is advantageous, because it results in Less shrinkage in heating, decreased apparent porosity & increased specific gravity 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 All of these Less shrinkage in heating, decreased apparent porosity & increased specific gravity 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 All of these ANSWER DOWNLOAD EXAMIANS APP
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