Refractory Technology

In panel test for spalling resistance, the average face temperature of panel assembly is maintained at ______________ °C for 24 hours? A. 700 B. 1000C. 1600 D. 2000

Fireclay bricks is not used for lining the__________________? A. Cupola B. Gas producerC. Bottom of hot metal mixer D. Roof of open hearth furnace

Fireclay refractories____________________? A. Are not resistant to the action of basic slags B. Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc C.…

Silica bricks are never used for lining the____________________? A. Beehive coke ovens B. By-product coke ovens C. Dome of blast furnace stoves D. Roof of open hearth furnace

Refractory bricks having lower porosity have_________________________? A. High insulating properties B. Low heat capacity C. Low thermal conductivityD. Greater strength

Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________? A. FireclayB. Silicon carbide C. Corundum D. Siliceous fireclay…

Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors? A. Beryllia B. Carborundum C. Corundum D. Thoria…

Refractory bricks with lower permeability is produced by using __________________? A. Higher firing temperature B. Higher moulding pressure C. Finer grog sizeD. All A., B. and C.

Addition of zircon to silica refractory brick improves its_____________________? A. Crushing strengthB. Resistance to slag attack C. Both A. and B. D. Neither A. nor B.

Bottom of basic open hearth furnace are constructed of__________________? A. Dead burnt magnesite ramming mass B. Porous fireclay bricks C. Semi-silica bricks D. Silicon carbide bricks