Related Mcqs:

1. 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

2. 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.

3. 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

4. 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

5. Blast furnace slag is mainly molten_________________?

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

6. 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

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

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

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

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

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