Maximum apparent porosity of magnesite bricks is about _____________ percent?

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. Porosity of silica bricks varies from ______________ percent?

   A. 5 to 10 B. 20 to 30 C. 45 to 60 D. 60 to 75...

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

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

4. Magnesite bricks have poor resistance to attack by _____________ slag?

   A. Lime B. Basic C. Acid D. None of these...

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

   A. Al2O3 B. CaO C. SiO2 D. All A., B. & C....

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. High porosity refractory bricks have _______________?

    A. Poor resistance to the penetration of molten slag, metal & flue gases B. Poor heat conductivity & low strength C. Better thermal spalling resistance D. All A., B. and C....