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
A. Tridymite
B. Cristobalite
C. Quartz
D. None of these
A. Segar cones
B. Orton cones
C. Pressure vessels
D. Ovens & retorts
A. Are bonded with lime and clay
B. (Free from silica) have better thermal fatigue resistance than silica and magnesite refractories.
C. Are resistant to basic slag
D. All A., B. and C.
A. Resistance to slag penetration
B. Resistance to CO attack
C. RUL
D. Permanent linear change
A. Al2O3
B. CaO
C. SiO2
D. All A., B. & C.