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

Related Mcqs:

Which of the following does not occur during firing/burning of refractories ?

A. Removal of water of hydration B. Vitrification C. Decrease in crushing strength D. Development of stable mineral form...

With increase in the alumina content in firebricks, its fusion point (refractoriness) ?

A. Decreases linearly B. Remains unchanged C. Increases D. Decreases...

Porosity of silica bricks varies from ______________ percent?

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

Spalling tendency of refractories is reduced by increasing its_________________?

A. Porosity B. Specific gravity C. Thermal conductivity D. Strength...

______________ bricks should not be used in oxidising atmosphere?

A. Tar dolomite B. Carbon C. Silica D. Fireclay...