Which one contains maximum percentage of Al2O3 ?

Related Mcqs:

1. 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

2. Which one contains minimum percentage of SiO2 ?

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

3. 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

4. Periclase refractory contains mainly________________?

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

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

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

6. SiO2 percentage in firebrick is about____________________?

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

7. 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.

8. Maximum alumina content in high alumina refractory can be as high as _____________ percent?

   A. 30
   B. 50
   C. 70
   D. 90

9. Which furnace consumes maximum refractory annually in an integrated steel plant ?

   A. Soaking pit
   B. Blast furnace
   C. L.D. converter
   D. Coke ovens

10. The maximum linear expansion of silica bricks during firing is about ______________ percent?

    A. 0.5
    B. 1
    C. 2
    D. 3.5