The main raw material for manufacture of silicon carbide refractories is_________________?

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. Fireclay
B. Silicon carbide
C. Corundum
D. Siliceous fireclay

A. Powdered naphthalene
B. Ammonium chloride/sulphate
C. Calcium phosphate
D. All A., B. and C.

A. Coke ovens regenerator
B. Outer lining of L.D. converter
C. Hearth bottom of blast furnace
D. Coke oven walls

A. 45
B. 60
C. 80
D. 95

A. Al2O3
B. CaO
C. SiO2
D. All A., B. & C.