Search
.Management Sciences
Category: Refractory Technology
Graphite or carbon refractories______________________?
A. Exhibit wetting characteristics
B. Should be used in neutral or reducing atmosphere
C. Exhibit high shrinkage on thermal treatment
D. Are not resistant to corrosion by slag
Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?
A. At the hearth bottom of the furnace on which stock is placed
B. Used for furnace insulation
C. Used in the roof of the furnace
D. None of these
Bauxite calcining rotary kilns are lined with ________________ bricks?
A. Fireclay
B. Carbon
C. 85% alumina
D. Corundum
Silica refractories are not used in _________________?
A. Coke oven walls
B. Beehive coke ovens
C. Dome and upper portion of B.F. stoves
D. Open hearth furnace roof
With increase in the density of silica refractories, its_______________?
A. Resistance to slag attack increases
B. Spalling resistance reduces
C. Both A. and B.
D. Neither A. nor B.
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in ______________ zone?
A. Preheating
B. Cooling
C. Burning
D. All the above
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?
A. Fireclay
B. Silicon carbide
C. Corundum
D. Siliceous fireclay
With increase in the porosity, thermal spalling resistance of fireclay brick___________________?
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease
Recent Comments