Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except Electrical conductivity Cost Fusion point Thermal conductivity TRUE ANSWER : ? YOUR ANSWER : ?
Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent. 14-20 7-12 5-7 2-3 TRUE ANSWER : ? YOUR ANSWER : ?
The highest melting pure oxide (m.p. > 3000°C) is Beryllia Zirconia Alumina Thoria TRUE ANSWER : ? YOUR ANSWER : ?
Refractory castables are used for Minimising the number of joints in the structure Producing monolithic linings All of these Patch work TRUE ANSWER : ? YOUR ANSWER : ?
__________ bricks should not be used in oxidising atmosphere. Fireclay Carbon Silica Tar dolomite TRUE ANSWER : ? YOUR ANSWER : ?
Which property of refractories is the most important for top section of the blast furnace? Resistance to corrosion by slag Resistance to abrasion Resistance to slag peneration Stability of volume at high temperature TRUE ANSWER : ? YOUR ANSWER : ?
Silica bricks are never used for lining the Dome of blast furnace stoves By-product coke ovens Beehive coke ovens Roof of open hearth furnace TRUE ANSWER : ? YOUR ANSWER : ?
Magnesite refractories are generally not used in the Burning zone of cement kilns Electric furnace walls Steel melting furnace Open hearth furnace TRUE ANSWER : ? YOUR ANSWER : ?
Panel test determines the __________ of refractories. Refractoriness under load (RUL) Fusion point Slag penetration resistance Spalling resistance TRUE ANSWER : ? YOUR ANSWER : ?
Fireclay bricks are never used in the Beehive oven Zinc roaster Coke oven walls Lead blast furnace TRUE ANSWER : ? YOUR ANSWER : ?