Pick out the wrong statement.
A. Sand & coke is the main raw material for the manufacture of silicon carbide
B. Carbon refractories can not be used in the furnaces operating under reducing conditions
C. Mullite can be obtained by the heating of alusite, kyanite or silimanite
D. Silica occurs in nature in all cellular, amorphous or crystalline form
Answer: Option B
This Question Belongs to Chemical Engineering >> Refractory Technology
Fusion point of an acidic refractory material is
A. Increased by the addition of basic oxides
B. Reduced by the addition of basic oxides
C. Not affected by the addition of basic oxides
D. Not affected by the addition of basic oxides
Which of the following is not a high alumina refractory material?
A. Kyanite
B. Sillimanite
C. Diaspore
D. Periclase
Magnesite refractories are generally not used in the
A. Electric furnace walls
B. Steel melting furnace
C. Open hearth furnace
D. Burning zone of cement kilns
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