Which property of refractories is the most important for top section of the blast furnace ?

Related Mcqs:

1. Faster rate of drying of moulded refractories results in high ______________ of refractories?

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

2. Hot metal runner in blast furnace are lined with ______________ bricks?

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

3. Outer combustion chamber of blast furnace stove is lined with _______________ bricks?

   A. Fireclay B. Silica C. Chrome magnesite D. Zirconia...

4. Refractoriness/fusion points of ‘Superduty’ refractories is _____________ °C?

   A. 1520-1630 B. 1630-1670 C. > 1730 D. > 2000...

5. Magnesite refractories are generally not used in the__________________?

   A. Electric furnace walls B. Steel melting furnace C. Open hearth furnace D. Burning zone of cement kilns...

6. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to__________________?

   A. Thermal spalling B. Slag attack C. Fusion under load D. CO attack...

7. Panel test determines the ______________ of refractories?

   A. Fusion point B. Spalling resistance C. Slag penetration resistance D. Refractoriness under load (RUL)...

8. Chemically, mullite refractories is________________?

   A. 3Al2O3.2SiO2 B. Al2O3 C. ZrSO4 D. ThO2...

9. Presence of MgO in alumino-silicate refractories ______________ its refractoriness ?

   A. Increases B. Lowers C. Does not affect D. Either A. or B.; depends on its quantity...

10. Magnesite refractories are used for the construction of those furnaces, which are_______________?

    A. Not required to resist the corrosive action of basic slag B. Not subjected to fluctuation in temperature C. Used for raising & maintaining high temperature D. Both B. and C....