Iron content in Indian iron ore is about _________________ percent?

Related Mcqs:

1. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of_________________?

   A. Lumps
   B. Pellets
   C. Briquettes
   D. Sinter

2. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother ?

   A. Cresylic acid
   B. Xanthaies
   C. Pine oil
   D. All A, B. & C.

3. Which of the following if present in iron ore, enhances its value ?

   A. Alumina
   B. Alkali oxide
   C. Lime & Magnesia
   D. None of these

4. _____________________ of grey cast iron produces white cast iron?

   A. Tempering
   B. Rapid heating
   C. Rapid cooling
   D. Slow cooling

5. Annealing of white cast iron produces _____________________ iron?

   A. Grey
   B. Nodular
   C. Malleable
   D. Spheroidal

6. ______________________ iron is produced by the annealing of white cast iron?

   A. Malleable
   B. Nodular
   C. Ductile
   D. Grey

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

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

8. Cast iron contains ____________________ percent carbon?

   A. 2.5
   B. 3.75
   C. 4.75
   D. 5.25

9. The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?

   A. 2-5
   B. 18-20
   C. 12-15
   D. 6-12

10. Maximum change in the hardness of martensite occurs in the carbon content range of _____________ percent in steel?

    A. 0.01 to 0.10
    B. 0.2 to 0.4
    C. 0.5 to 0.7
    D. 0.8 to 1.0