Related Mcqs:

1. 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

2. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of ______________ °C?

   A. 770
   B. 570
   C. 270
   D. 70

3. Fireclay bricks are not used in the_________________?

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

4. Which form of silica has the highest specific gravity ?

   A. Quartz
   B. Cristobalite
   C. Tridymite
   D. All have the same specific gravity

5. 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.

6. Permeability of bricks is a measure of the___________________?

   A. Refractoriness
   B. Melting point
   C. Rate at which a fluid will pass through the pores
   D. Expansion during heating

7. Refractory bricks with lower permeability is produced by using _________________?

   A. Higher firing temperature
   B. Higher moulding pressure
   C. Finer grog size
   D. All A., B. and C.

8. 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

9. An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?

   A. Cork
   B. Saw dust
   C. Sand
   D. Chemically prepared foam

10. Roof of a basic electric furnace is made of ______________ bricks?

    A. Superduty fireclay
    B. Silica
    C. Chromite
    D. None of these