Which of the following is not 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 is an acidic refractory ?

   A. Magnesite
   B. Dolomite
   C. Fireclay
   D. Chrome magnesite

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. Which of the following is not a neutral refractory ?

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

6. Which of the following is not a high alumina refractory material ?

   A. Kyanite
   B. Sillimanite
   C. Diaspore
   D. Periclase

7. Maximum water percentage in refractory mix meant for hand moulding may be as high as _____________ percent?

   A. 2-3
   B. 5-7
   C. 7-12
   D. 14-20

8. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?

   A. Tar bonded dolomite bricks
   B. Fireclay bricks
   C. Mullite bricks
   D. Magnesite bricks

9. High refractoriness of refractory bricks means, that it has a________________?

   A. High spalling resistance
   B. Low spalling resistance
   C. High resistance to fusion
   D. Low porosity

10. Refractory bricks with lower permeability is produced by using __________________?

    A. Higher firing temperature
    B. Higher moulding pressure
    C. Finer grog size
    D. All A., B. and C.