A. Spalling rate
B. Fusion point
C. Shrinkage ability
D. None of these
Related Mcqs:
- Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?
A. Pottery furnace
B. Glass melting furnace
C. Crucibles
D. Gas retorts - Refractory materials are never used in the construction of _________________?
A. Segar cones
B. Orton cones
C. Pressure vessels
D. Ovens & retorts - Firing of refractory brick is done to __________________?
A. Dehydrate the dried refractory
B. Develop stable mineral forms in them
C. Form ceramic bonds necessary for development of high crushing strength in the finished
product
D. All A., B. and C. - ‘Spinel’, a refractory mineral is chemically represented as____________________?
A. MgAl2O4
B. MgAl2O3
C. MgSO4
D. MgAl2O3.2H2O - Resistance to slag attack of a refractory _____________________?
A. Depends on the nature of slag & refractory
B. Decreases at higher temperature
C. Decreases, if defective joints & cracks exist in the refractory
D. All A., B. and C. - Maximum alumina content in high alumina refractory can be as high as _____________ percent?
A. 30
B. 50
C. 70
D. 90 - Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory_________________?
A. Mortars
B. Cements
C. Castables
D. None of these - ___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?
A. Porosity
B. RUL
C. Specific gravity
D. Thermal conductivity - Refractory bricks having lower porosity have_________________________?
A. High insulating properties
B. Low heat capacity
C. Low thermal conductivity
D. Greater strength - Which is not an acidic refractory ?
A. Silica
B. Fireclay
C. High alumina refractory
D. Carbon black
