Refractory Technology Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the Hearth of the blast furnace Nuclear reactors, missiles & space crafts Roof of electric furnaces Insulation of high temperature furnaces Hearth of the blast furnace Nuclear reactors, missiles & space crafts Roof of electric furnaces Insulation of high temperature furnaces 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? Saw dust Cork Sand Chemically prepared foam Saw dust Cork Sand Chemically prepared foam ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Resistance to slag attack of a refractory Decreases at higher temperature Depends on the nature of slag & refractory Decreases, if defective joints & cracks exist in the refractory All of these Decreases at higher temperature Depends on the nature of slag & refractory Decreases, if defective joints & cracks exist in the refractory All of these ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which of the following is not an acidic refractory? Fireclay bricks Bauxite bricks Silica bricks Magnesia bricks Fireclay bricks Bauxite bricks Silica bricks Magnesia bricks ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Presence of MgO in alumino-silicate refractories __________ its refractoriness. Increases Does not affect Either A or B; depends on its quantity Lowers Increases Does not affect Either A or B; depends on its quantity Lowers ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Periclase is ZrSO₄ Crystalline form of MgO Amorphous magnesite MgCO₃ ZrSO₄ Crystalline form of MgO Amorphous magnesite MgCO₃ ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS