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

Sillimanite is a _____________ refractory?
A. Basic B. Neutral C. High alumina D. Insulating...
Which of the following is not a neutral refractory ?
A. Silicon carbide B. Magnesite C. Chromite D. Graphite...
Which one contains maximum percentage of Al2O3 ?
A. Firebrick B. Sillimanite C. Magnesite D. Aluminous firebrick...
SiO2 percentage in firebrick is about____________________?
A. 35-40 B. 55-60 C. 80-85 D. > 94...
Which one contains minimum percentage of SiO2 ?
A. Firebrick B. Sillimanite C. Semi-silica D. Aluminous firebrick...
Fusion temperature of pure silica (SiO2) is _______________ °C?
A. 1350 B. 1715 C. 2570 D. 2800...
Thermal diffusivity of a refractory brick is high, when its ____________ is high?
A. Density B. Specific heat C. Thermal conductivity D. None of these...
High density refractory bricks have lower__________________?
A. Spalling resistance B. Thermal conductivity C. Fusion point D. Slag penetration resistance...
Addition of zircon to silica refractory brick improves its_____________________?
A. Crushing strength B. Resistance to slag attack C. Both A. and B. D. Neither A. nor B....
Fusion point of a basic refractory material is__________________?
A. Reduced by the addition of acid oxides B. Increased by the addition of acid oxides C. Not affected by the addition of acid oxides D. Always less than 1000°C...