Which one contains minimum percentage of SiO2 ?

Related Mcqs:

1. SiO2 percentage in firebrick is about____________________?

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

2. 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

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

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

4. Which one contains maximum percentage of Al2O3 ?

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

5. Firing temperature is minimum (1250-1400 °C) for _______________ bricks?

   A. Fireclay
   B. Direct bonded basic
   C. Silica
   D. Magnesite

6. Periclase refractory contains mainly________________?

   A. CaO
   B. MgO
   C. Al2O3
   D. SiO2

7. Si percentage in silica refractories used in the walls of coke oven is about______________________?

   A. 45
   B. 60
   C. 80
   D. 95

8. 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

9. Use of higher percentage of lime for bonding silica bricks, reduces their__________________?

   A. Strength
   B. Abrasion resistance
   C. Both A. & B.
   D. Neither A. nor B.

10. Chrome magnesite is not used in the ____________________?

    A. Inner lining of L.D. converter
    B. Aluminium melting furnaces
    C. Wear out lining of steel melting furnaces
    D. All A., and B. and C.