A. Inner lining of L.D. converter
B. Aluminium melting furnaces
C. Wear out lining of steel melting furnaces
D. All A., and B. and C.
Related Mcqs:
- 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 - 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 - 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. - 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. - Chrome magnesite brick is not used for lining the___________________?
A. Hearth of soaking pits
B. Bottom hearth of reheating furnace
C. Coke oven regenerator
D. Burning zone of limestone rotary kilns - Rotary kilns meant for calcination of limestone are lined with chrome magnesite in ______________ zone?
A. Preheating
B. Cooling
C. Burning
D. All the above - 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 - Which of the following impurities reduces the refractoriness of magnesite bricks ?
A. Al2O3
B. CaO
C. SiO2
D. All A., B. & C. - Magnesite refractories are used for the construction of those furnaces, which are________________?
A. Not required to resist the corrosive action of basic slag
B. Not subjected to fluctuation in temperature
C. Used for raising & maintaining high temperature
D. Both B. and C. - Magnesite bricks have poor resistance to attack by _____________ slag?
A. Lime
B. Basic
C. Acid
D. None of these
