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.Management Sciences
Category: Refractory Technology
Bauxite calcining rotary kilns are lined with ________________ bricks?
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A. Fireclay
B. Carbon
C. 85% alumina
D. Corundum
In chemical process equipments, the conical bottom heads used, usually has an apex angle of____________________?
A. 20°
B. 40°
C. 60°
D. 80°
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
Silica refractories__________________?
A. crack when subjected to sudden change of temperature
B. Cannot be used in the dome of hot blast stoves
C. Have lower thermal conductivity than fireclay bricks
D. All A., B. and C.
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