Refractory Technology With increasing alumina content, the fusion point of high alumina refractories Increases Remains constant Decreases May increase or decrease ; depends on its alumina content Increases Remains constant Decreases May increase or decrease ; depends on its alumina content ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C. 770 70 270 570 770 70 270 570 ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Highest melting (m.p = 3070°C) oxide refractory is Zirconia Magnesia Thoria Alumina Zirconia Magnesia Thoria Alumina ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Which property of refractories is the most important for top section of the blast furnace? Stability of volume at high temperature Resistance to slag peneration Resistance to corrosion by slag Resistance to abrasion Stability of volume at high temperature Resistance to slag peneration Resistance to corrosion by slag Resistance to abrasion ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Quartz is All of these Converted to tridymite on firing between 870 to 1470°C Transformed to crystoballite on heating above 1470°C Stable form of silica upto 870°C All of these Converted to tridymite on firing between 870 to 1470°C Transformed to crystoballite on heating above 1470°C Stable form of silica upto 870°C ANSWER DOWNLOAD EXAMIANS APP
Refractory Technology Magnesite refractories are generally not used in the Open hearth furnace Electric furnace walls Steel melting furnace Burning zone of cement kilns Open hearth furnace Electric furnace walls Steel melting furnace Burning zone of cement kilns ANSWER DOWNLOAD EXAMIANS APP
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