Fireclay refractories have __________________?

Related Mcqs:

1. Porosity of fireclay refractories is _______________ percent?

   A. 5-10 B. 10-25 C. 25-35 D. 35-50...

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

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

3. Carbon refractories have very high __________________?

   A. Wetting characteristics B. Refractoriness C. Thermal conductivity D. Both B. and C....

4. Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?

   A. Oxidising B. Neutral C. Either A. or B. D. Neither A. nor B....

5. Fireclay bricks are not used in the _________________?

   A. Beehive coke oven B. By-product coke oven walls C. Combustion chamber of B.F. stoves D. Coke oven regenerators...

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

   A. Less shrinkage in heating, decreased apparent porosity & increased specific gravity B. High strength & thermal spalling resistance C. Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production D. All A., B. and C....

7. 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...

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...