Magnesite refractories are used for the construction of those furnaces, which are________________?

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. 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...

3. 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...

4. Magnesite refractories have low resistance to___________________?

   A. Attack by basic slag B. Abrasion C. Disintegration on sudden change of temperature D. Both B. and C....

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

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

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

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

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

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

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

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

9. Magnesite chrome refractories____________________?

   A. Have better spalling resistance than chrome magnesite refractories B. Have very low thermal co-efficient of expansion C. Are not at all resistant to the corrosive action of iron oxide D. Have very low (50 kg/cm2) cold crushing strength (C.C.S.), and cannot be used in metalcase form...

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

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