Which is an acidic refractory ?

Related Mcqs:

1. Fusion point of an acidic refractory material is________________?

   A. Increased by the addition of basic oxides
   B. Reduced by the addition of basic oxides
   C. Not affected by the addition of basic oxides
   D. Always more than 2500°C

2. Which of the following is not an acidic refractory?

   A. Silica bricks
   B. Fireclay bricks
   C. Bauxite bricks
   D. Magnesia bricks

3. Which is not an acidic refractory ?

   A. Silica
   B. Fireclay
   C. High alumina refractory
   D. Carbon black

4. 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

5. Refractory castables are used for__________________?

   A. Producing monolithic linings
   B. Patch work
   C. Minimising the number of joints in the structure
   D. All A., B. and C.

6. _____________ is not a single oxide-refractory?

   A. Zirconia
   B. Silicon carbide
   C. Magnesia
   D. None of these

7. Which is required in an insulating refractory ?

   A. High thermal conductivity
   B. Low porosity
   C. Both A. and B.
   D. Neither A. nor B.

8. Which is not a high alumina refractory ?

   A. Mullite
   B. Corundum
   C. Bauxite
   D. Dolomite

9. Cold crushing strength of a refractory does not depend upon its ____________________?

   A. Shape
   B. Composition
   C. Firing temperature
   D. Texture

10. High alumina refractory compared to fireclay bricks have____________________?

    A. Less load bearing capacity
    B. Less resistance to slag attack
    C. Low refractoriness
    D. High resistance to thermal shock and creep