Maximum apparent porosity of magnesite bricks is about _____________ percent?
A. 8
B. 24
C. 44
D. 58
Refractory Technology
Chromite refractories are used in_______________?
Chromite refractories are used in_______________?
A. Bottom of soaking pits
B. Between acid & basic linings in basic open hearth furnaces to prevent their chemical action
with each other
C. Both A. & B.
D. Neither A. and B.
Carbon refractory blocks ___________________?
Carbon refractory blocks ___________________?
A. Are wetted by molten iron
B. Are used in the hearth of blast furnace
C. Are acidic in nature
D. All A., B. and C.
Fireclay bricks are used in the___________________?
Fireclay bricks are used in the___________________?
A. Furnaces allowed to cool frequently
B. Flues
C. Chimney linings
D. All A., B. and C.
High density refractory bricks have lower__________________?
High density refractory bricks have lower__________________?
A. Spalling resistance
B. Thermal conductivity
C. Fusion point
D. Slag penetration resistance
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the_________________?
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the_________________?
A. Washing action of metal
B. Corrosion by layer of slag
C. Both A. & B.
D. Neither A. nor B.
The main raw material for manufacture of silicon carbide refractories is_________________?
The main raw material for manufacture of silicon carbide refractories is_________________?
A. Corundum
B. Carborundum
C. Bauxite
D. Periclase
Alumina-graphite bricks are used for lining the ____________________?
Alumina-graphite bricks are used for lining the ____________________?
A. Slide gate in teeming laddies
B. Continuous casting systems
C. Both A. and B.
D. Neither A. nor B.
Porosity of silica bricks varies from ______________ percent?
Porosity of silica bricks varies from ______________ percent?
A. 5 to 10
B. 20 to 30
C. 45 to 60
D. 60 to 75
Silica refractories are not used in _________________?
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