Firing temperature of magnesite bricks is about _____________ °C?

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

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

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

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

4. Firing temperature is minimum (1250-1400 °C) for _______________ bricks?

   A. Fireclay
   B. Direct bonded basic
   C. Silica
   D. Magnesite

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. The maximum linear expansion of silica bricks during firing is about ______________ percent?

    A. 0.5
    B. 1
    C. 2
    D. 3.5