Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?

Related Mcqs:

1. Sillimanite is a _____________ refractory?

   A. Basic
   B. Neutral
   C. High alumina
   D. Insulating

2. Which of the following is not a neutral refractory ?

   A. Silicon carbide
   B. Magnesite
   C. Chromite
   D. Graphite

3. Which one contains maximum percentage of Al2O3 ?

   A. Firebrick
   B. Sillimanite
   C. Magnesite
   D. Aluminous firebrick

4. SiO2 percentage in firebrick is about____________________?

   A. 35-40
   B. 55-60
   C. 80-85
   D. > 94

5. Which one contains minimum percentage of SiO2 ?

   A. Firebrick
   B. Sillimanite
   C. Semi-silica
   D. Aluminous firebrick

6. Fusion temperature of pure silica (SiO2) is _______________ °C?

   A. 1350
   B. 1715
   C. 2570
   D. 2800

7. Thermal diffusivity of a refractory brick is high, when its ____________ is high?

   A. Density
   B. Specific heat
   C. Thermal conductivity
   D. None of these

8. High density refractory bricks have lower__________________?

   A. Spalling resistance
   B. Thermal conductivity
   C. Fusion point
   D. Slag penetration resistance

9. 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.

10. 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