Silica bricks are never used for lining the____________________?

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. Carbon bricks are not used in the lining of the_________________?

   A. Combustion chamber of blast furnace stoves
   B. Electric furnaces
   C. Highly chemical resistant equipments
   D. Blast furnace hearth

3. Alumina-graphite bricks are used for lining the ____________________?

   A. Slide gate in teeming laddies
   B. Continuous casting systems
   C. Both A. and B.
   D. Neither A. nor B.

4. Fireclay bricks is not used for lining the__________________?

   A. Cupola
   B. Gas producer
   C. Bottom of hot metal mixer
   D. Roof of open hearth furnace

5. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material ?

   A. Aluminium phosphate
   B. Water
   C. Lime
   D. Plaster of Paris

6. Porosity of silica bricks varies from ______________ percent?

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

7. Silica bricks have low spalling resistance below 600°C, due to its________________?

   A. Very high thermal conductivity
   B. High co-efficient of expansion upto this temperature
   C. High thermal diffusivity
   D. Low refractoriness

8. 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.

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

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

10. Fireclay bricks are never used in the______________?

    A. Beehive oven
    B. Coke oven walls
    C. Zinc roaster
    D. Lead blast furnace