A. Spalling rate
B. Fusion point
C. Shrinkage ability
D. None of these
An ideal refractory should have high__________________? Read More »
Refractory Technology A. Wetting characteristics
B. Refractoriness
C. Thermal conductivity
D. Both B. and C.
Carbon refractories have very high __________________? Read More »
Refractory Technology A. Does not react with basic slags
B. Is produced from baddeleyite
C. Cannot be used as an insulator
D. Has poor electrical conductivity at high temperature
Zirconia refractory_________________? Read More »
Refractory Technology A. Exhibit wetting characteristics
B. Should be used in neutral or reducing atmosphere
C. Exhibit high shrinkage on thermal treatment
D. Are not resistant to corrosion by slag
Graphite or carbon refractories______________________? Read More »
Refractory Technology A. Segar cones
B. Orton cones
C. Pressure vessels
D. Ovens & retorts
Refractory materials are never used in the construction of _________________? Read More »
Refractory Technology A. Side walls of soaking pits and arc furnaces
B. Copper melting furnaces & converters
C. Burner block of glass tanks
D. All A., B. and C.
Chrome magnesite bricks are used in the_________________? Read More »
Refractory Technology A. Silica
B. Fireclay
C. Dolomite
D. Magnesite
Roof of a basic open hearth furnace is lined with ______________ bricks? Read More »
Refractory Technology A. Silica bricks
B. Fireclay bricks
C. High alumina bricks
D. Tar dolomite bricks
Which of the following bricks has the most close values of RUL and PCE ? Read More »
Refractory Technology A. Quartz
B. Cristobalite
C. Tridymite
D. None of these
Which is the most stable crystalline form of silica at room temperature ? Read More »
Refractory Technology A. 1800
B. 2200
C. 2400
D. 2700
