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.
A. Resistance to slag attack increases
B. Spalling resistance reduces
C. Both A. and B.
D. Neither A. nor B.
A. Hearth of soaking pits
B. Bottom hearth of reheating furnace
C. Coke oven regenerator
D. Burning zone of limestone rotary kilns
A. Fireclay
B. Silicon carbide
C. Corundum
D. Siliceous fireclay
A. Resistance to slag penetration
B. Resistance to CO attack
C. RUL
D. Permanent linear change
A. Strength
B. Thermal conductivity
C. Spalling resistance
D. None of these
A. Depends on the nature of slag & refractory
B. Decreases at higher temperature
C. Decreases, if defective joints & cracks exist in the refractory
D. All A., B. and C.