Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?

Related Mcqs:

1. Grog addition in fireclay during brick manufacture is done to_________________?

   A. Reduce its shrinkage on heating
   B. Impart greater spalling resistance
   C. Enhance the strength of fired refractories
   D. All A., B. and C.

2. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?

   A. 450
   B. 250
   C. 150
   D. 65

3. Addition of zircon to silica refractory brick improves its_____________________?

   A. Crushing strength
   B. Resistance to slag attack
   C. Both A. and B.
   D. Neither A. nor B.

4. Fireclay bricks are never used in the______________?

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

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

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

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

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

7. Fireclay refractories have __________________?

   A. Low co-efficient of thermal expansion
   B. Poor thermal spalling resistance
   C. Tendency to expand unduly high during firing
   D. Very high cost

8. Colour of fireclay bricks is_________________?

   A. Light buff to reddish buff
   B. Yellow
   C. Black
   D. None of these

9. Fireclay bricks are used in the__________________?

   A. Coke ovens regenerator
   B. Outer lining of L.D. converter
   C. Hearth bottom of blast furnace
   D. Coke oven walls

10. Fireclay bricks are not used in the_____________________?

    A. Blast furnace
    B. Hot blast stove
    C. Cupola
    D. Wall of coke oven