______________ bricks should not be used in oxidising atmosphere?

Related Mcqs:

1. Semi-silica bricks compared to silica bricks have_______________?

   A. Less fusion point
   B. Better spalling resistance
   C. Both A. and B.
   D. Neither A. not B.

2. ______________ bricks are used in the burning zone of a cement rotary kiln ?

   A. High alumina
   B. Fireclay
   C. Thoria
   D. Silicon carbide

3. Roof of a basic open hearth furnace is lined with ______________ bricks?

   A. Silica
   B. Fireclay
   C. Dolomite
   D. Magnesite

4. 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

5. Porosity of silica bricks varies from ______________ percent?

   A. 5 to 10
   B. 20 to 30
   C. 45 to 60
   D. 60 to 75

6. Cold crushing strength of fireclay bricks is about ______________ kgf/cm2?

   A. 50-100
   B. 100-150
   C. 200-400
   D. 500-1000

7. . Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ °C?

   A. 500
   B. 1000
   C. >1350
   D. >2000

8. Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?

   A. High duty fireclay
   B. Silica
   C. Mullite
   D. Carborundum

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

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

10. Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?

    A. Silica
    B. Fireclay
    C. Magnesite
    D. Zirconia