Which of the following impurities reduces the refractoriness of magnesite bricks ?

Related Mcqs:

1. 10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the _____________ of Chromite?

   A. Spalling resistance B. Refractoriness C. Crushing strength D. Resistance to slag...

2. High refractoriness of refractory bricks means, that it has a________________?

   A. High spalling resistance B. Low spalling resistance C. High resistance to fusion D. Low porosity...

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

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

4. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?

   A. Fireclay B. Silica C. Dolomite D. Very low alumina...

5. Chrome magnesite bricks are_________________?

   A. Acidic in nature B. Neutral in nature C. Having higher RUL than silica bricks D. Made by mixing 30% Chromite and 70% Periclase...

6. Chrome magnesite bricks are used in the_________________?

   A. Side walls of soaking pits and arc furnaces B. Copper melting furnaces & converters C. Burner block of glass tanks D. All A., B. and C....

7. Magnesite chrome bricks are used in the___________________?

   A. Roof lining of basic open hearth & other basic furnaces B. Reheating furnaces C. Soaking pits D. All A., B. and C....

8. Firing temperature of magnesite bricks is about _____________ °C?

   A. 800-1000 B. 1000-1200 C. 1600-1800 D. 2400-2600...

9. Magnesite bricks are used in those parts of furnaces, which are __________________?

   A. Subjected to temperature fluctuation B. Required to resist corrosive basic slag C. Subjected to high load D. None of these...

10. Maximum apparent porosity of magnesite bricks is about _____________ percent?

    A. 8 B. 24 C. 44 D. 58...