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

Related Mcqs:

1. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?

   A. 55
   B. 70
   C. 80
   D. 90

2. With increase in the alumina content, the refractoriness of high alumina refractories_______________?

   A. Increases
   B. Decreases
   C. Remain same
   D. May increase or decrease

3. With increasing alumina content, the fusion point of high alumina refractories__________________?

   A. Increases
   B. Decreases
   C. Remain constant
   D. May increase or decrease; depends on its alumina content

4. Which is not a high alumina refractory ?

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

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

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

6. 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

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. Water content in ground refractory material to be shaped into bricks by hand moulding is about ______________ percent?

   A. 5
   B. 20
   C. 40
   D. 55

9. With increase in the alumina content in firebricks, its fusion point (refractoriness) ?

   A. Decreases linearly
   B. Remains unchanged
   C. Increases
   D. Decreases

10. 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