Refractory Technology

A. Spalling resistance
B. Refractoriness
C. Crushing strength
D. Resistance to slag

A. Tar bonded dolomite bricks
B. Fireclay bricks
C. Magnesite bricks
D. Chromite bricks

A. Mullite
B. Corundum
C. Bauxite
D. Dolomite

A. Porosity
B. Specific gravity
C. Thermal conductivity
D. Strength

A. Mainly contains quartz
B. Is not stable at high temperature
C. Transforms to other allotropic forms i.e. Tridymite and Cristobalite involving very high
volume changes
D. All A., B. and C.

A. 500
B. 1000
C. >1350
D. >2000

A. Do not burn/oxidise, when exposed to air on heating
B. Are not attacked by slags, as they are not wetted by melts
C. Do not resist temperature fluctuations
D. Have extremely low thermal & electrical conductivities

A. Basic
B. Neutral
C. High alumina
D. Insulating

A. High thermal conductivity
B. Low porosity
C. Both A. and B.
D. Neither A. nor B.

A. Silica
B. Periclase
C. Lime
D. None of these