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  1. Haematite iron ore contains iron about

  2. A.
    30%
    B.
    45%
    C.
    55%
    D.
    70%

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  3. The material in which the atoms are arranged regularly in some directions but not in others, is called

  4. A.
    amorphous material
    B.
    mesomorphous material
    C.
    crystalline material
    D.
    none of these

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  5. The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.

  6. A.
    superior
    B.
    inferior

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  7. Crystal structure of a material is, generally, examined by

  8. A.
    naked eye
    B.
    optical microscope
    C.
    metallurgical microscope
    D.
    X-ray techniques

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  9. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

  10. A.
    eutectic cast irons
    B.
    hypo-eutectic cast irons
    C.
    hyper-eutectic cast irons
    D.
    none of these

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  11. The coke in the charge of blast furnace

  12. A.
    controls the grade of pig iron
    B.
    acts as an iron-bearing mineral
    C.
    supplies heat to reduce ore and melt the iron
    D.
    forms a slag by combining with impurities

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  13. Nimonic contains __________ percentage of nickel as that of Inconel.

  14. A.
    same
    B.
    less
    C.
    more

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  15. The heat treatment process used for softening hardened steel is

  16. A.
    carburising
    B.
    normalising
    C.
    annealing
    D.
    tempering

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  17. The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese.

  18. A.
    Yes
    B.
    No

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  19. The electric process of steel making is especially adopted to

  20. A.
    alloy and carbon tool steel
    B.
    magnet steel
    C.
    high speed tool steel
    D.
    all of these

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