Sillimanite is a _____________ refractory?
Sillimanite is a _____________ refractory?
A. Basic
B. Neutral
C. High alumina
D. Insulating
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Zircon refractories have__________________?
Zircon refractories have__________________?A. Low co-efficient of expansion
B. High RUL (1600°C) and refractoriness (> 2000°C)
C. High spalling resistance
D. All A., B. and C.Thoria__________________?
Thoria__________________?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.Porosity is induced in insulating refractories by adding________________?
Porosity is induced in insulating refractories by adding________________?A. Powdered naphthalene
B. Ammonium chloride/sulphate
C. Calcium phosphate
D. All A., B. and C.The highest melting pure oxide (m.p. > 3000°C)is___________________?
The highest melting pure oxide (m.p. > 3000°C)is___________________?A. Thoria
B. Alumina
C. Beryllia
D. ZirconiaSpalling tendency of refractories is reduced by increasing its_________________?
Spalling tendency of refractories is reduced by increasing its_________________?A. Porosity
B. Specific gravity
C. Thermal conductivity
D. StrengthWhich is the stable form of silica below 870°C ?
Which is the stable form of silica below 870°C ?A. Tridymite
B. Cristobalite
C. Quartz
D. None of these