Related Mcqs:

1. 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

2. Specific gravity of hot metal (pig iron) is ______________ times that of the blast furnace slag ?

   A. 2
   B. 3
   C. 0.8
   D. 6

3. Limestone addition in the blast furnace is done to flux _______________ present in the raw materials?

   A. SiO2
   B. Al2O3
   C. MnO2
   D. P

4. 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

5. Increasing sulphur content in pig iron tends to make it ________________?

   A. Soft
   B. Hard
   C. Tough
   D. Ductile & malleable

6. Dephosphorization of molten pig iron is favoured by_______________________?

   A. Oxidising and basic slag
   B. Reducing and basic slag
   C. High activity co-efficient of phosphorous in metal
   D. Oxidising and neutral slag

7. Blast furnace slag is mainly molten_________________?

   A. Sand
   B. Magnesium silicate
   C. Calcium silicate
   D. Iron pyrite

8. For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be___________________?

   A. 100% indirect reduction
   B. 100% direct reduction
   C. 50-60% indirect reduction
   D. 30-40% indirect reduction

9. 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

10. 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