A. 100% indirect reduction
B. 100% direct reduction
C. 50-60% indirect reduction
D. 30-40% indirect reduction
Related Mcqs:
- In the blast furnace, incorporation of water vapour in the blast gives the following effect ?
A. Increases the reducing potential of the gas
B. Increases the flame temperature
C. No significant change occurs
D. Increases the hydrogen content in the metal - Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to___________________?
A. Achieve very high purity of aluminium (99.9%)
B. Keep the electrolyte in liquid condition by the generation of heat
C. Electrolytically dissociate alumina
D. Both B. & C. - Volume of blast furnace slag is about _______________ times the volume of hot metal (pig iron) of the same weight ?
A. 1.5
B. 3
C. 5
D. 7 - Limestone is added in the blast furnace (during pig iron manufacture) to______________________?
A. Form slag by combining with impurities
B. Supply heat by undergoing exothermic reaction with impurities
C. Reduce the coke consumption
D. Reduce slag viscosity - Blast furnace slag is mainly molten_________________?
A. Sand
B. Magnesium silicate
C. Calcium silicate
D. Iron pyrite - The approximate height of a blast furnace having a useful volume of 2000 m3 is about _______________ metres ?
A. 25
B. 35
C. 55
D. 75 - Limestone addition in the blast furnace is done to flux _______________ present in the raw materials?
A. SiO2
B. Al2O3
C. MnO2
D. P - Specific gravity of hot metal (pig iron) is ______________ times that of the blast furnace slag ?
A. 2
B. 3
C. 0.8
D. 6 - Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
A. Sinter
B. Coke
C. Iron ore
D. Limestone - The main charge in blast furnace is usually___________________?
A. Iron ore & coke
B. Iron ore, coke & air
C. Limestone, coke & iron ore
D. Limestone, sand & iron ore
