Refractory Technology

A. Shape
B. Composition
C. Firing temperature
D. Texture

A. Cristobalite
B. Tridymite
C. Quartz
D. None of these

A. 1150
B. 1300
C. 1450
D. 1550

A. Non-wetting characteristic
B. High thermal conductivity
C. High crushing strength
D. None of these

A. Carbides
B. Oxides
C. Borides
D. Nitrides

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. Strength
B. Abrasion resistance
C. Both A. & B.
D. Neither A. nor B.

A. Less shrinkage in heating, decreased apparent porosity & increased specific gravity
B. High strength & thermal spalling resistance
C. Less addition of water to get a workable plasticity & lesser time required for drying the raw
refractories and hence increased rate of production
D. All A., B. and C.

A. Spalling resistance
B. Fusion point
C. Resistance to slag penetration
D. Resistance to carbon monoxide attack

A. Obtaining monolithic working faces
B. Repairing construction of various furnace parts
C. Both A. & B.
D. Neither A. nor B.