A. Dead burnt magnesite ramming mass
B. Porous fireclay bricks
C. Semi-silica bricks
D. Silicon carbide bricks
A. Al2O3. 2SiO2
B. 3Al2O3. 2SiO2
C. Al2O3. SiO2
D. 2Al2O3. 3SiO2
A. Chemical composition
B. Physical structure
C. Presence of impurities like iron & alkali
D. All A., B. and C.
A. Segar cones
B. Muffles for muffle furnaces
C. Insulating bricks
D. Crucibles used for melting of high purity metals
A. Slip casting
B. Hand moulding
C. pressing/machine moulding
D. Extrusion
A. Furnaces allowed to cool frequently
B. Flues
C. Chimney linings
D. All A., B. and C.
A. Have better spalling resistance than chrome magnesite refractories
B. Have very low thermal co-efficient of expansion
C. Are not at all resistant to the corrosive action of iron oxide
D. Have very low (50 kg/cm2) cold crushing strength (C.C.S.), and cannot be used in metalcase
form