Refractory Technology

A. Low co-efficient of thermal expansion
B. Poor thermal spalling resistance
C. Tendency to expand unduly high during firing
D. Very high cost

A. Resistance to slag penetration
B. Resistance to CO attack
C. RUL
D. Permanent linear change

A. 1520
B. 1630
C. 1670
D. 1730

A. Segar cones
B. Muffles for muffle furnaces
C. Insulating bricks
D. Crucibles used for melting of high purity metals

A. 450
B. 250
C. 150
D. 65

A. High duty fireclay
B. Silica
C. Mullite
D. Carborundum

A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on its alumina content

A. Silica bricks
B. Low duty firebricks
C. High alumina bricks
D. Graphite blocks

A. Acidic refractory
B. Neutral refractory
C. Basic refractory
D. Fired at a temperature of 600°C only

A. Has high fusion temperature (> 3000°C) but poor resistance to thermal shock
B. Has high resistance to basic slags
C. Which is expensive & radioactive, is used in crucibles for melting high purity metals
D. All A., B. and C.