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?

Related Mcqs:

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

   A. 30
   B. 50
   C. 70
   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. The main raw material for manufacture of silicon carbide refractories is_________________?

   A. Corundum
   B. Carborundum
   C. Bauxite
   D. Periclase

5. Faster rate of drying of moulded refractories results in high _____________ of refractories?

   A. Green strength
   B. Voids
   C. Shrinkage
   D. Both B. and C.

6. High alumina refractories are used in the ___________________?

   A. Dome of blast furnace stoves
   B. Electric arc furnace roof
   C. Glass melting furnaces
   D. All A., B. and C.

7. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?

   A. 10
   B. 15
   C. 20
   D. 30

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

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

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

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

10. Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors?

    A. Beryllia
    B. Carborundum
    C. Corundum
    D. Thoria