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 Chemically prepared foam Cork Sand Saw dust Chemically prepared foam Cork Sand ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology With increasing alumina content, the fusion point of high alumina refractories Decreases Remains constant Increases May increase or decrease ; depends on its alumina content Decreases Remains constant Increases May increase or decrease ; depends on its alumina content ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Carbon refractory blocks Are acidic in nature Are used in the hearth of blast furnace All of these Are wetted by molten iron Are acidic in nature Are used in the hearth of blast furnace All of these Are wetted by molten iron ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Ramming masses are used for Repairing construction of various furnace parts Neither A nor B Both A & B Obtaining monolithic working faces Repairing construction of various furnace parts Neither A nor B Both A & B Obtaining monolithic working faces ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Refractoriness/fusion points of 'superduty' refractories is __________ °C. > 2000 1630-1670 > 1730 1520-1630 > 2000 1630-1670 > 1730 1520-1630 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Porosity of silica bricks varies from __________ percent. 60 to 75 5 to 10 20 to 30 45 to 60 60 to 75 5 to 10 20 to 30 45 to 60 ANSWER DOWNLOAD EXAMIANS APP
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