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  1. In the lower part of the blast furnace (zone of fusion), the temperature is

  2. A.
    400° to 700°C
    B.
    800°C to 1000°C
    C.
    1200°C to 1300°C
    D.
    1500°C to 1700°C

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  3. Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

  4. A.
    Silicon
    B.
    Sulphur
    C.
    Manganese
    D.
    Phosphorus

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  5. Which of the following statement is wrong?

  6. A.
    A steel with 0.8% carbon is wholly pearlite
    B.
    The amount of cementite increases with the increase in percentage of carbon in iron
    C.
    A mechanical mixture of 87% cementite and 13% ferrite is called pearlite
    D.
    The cementite is identified as round particles in the structure

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  7. Inconel contains

  8. A.
    65% nickel, 15% chromium and 20% iron
    B.
    68% nickel, 29% copper and 3% other constituents
    C.
    80% nickel and 20% chromium
    D.
    80% nickel, 14% chromium and 6% iron

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  9. In a hardening process, the hypo-eutectoid steel is

  10. A.
    heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
    B.
    heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
    C.
    heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
    D.
    heated below or close to the lower critical temperature and then cooled slowly

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  11. The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

  12. A.
    coordination number
    B.
    atomic packing factor
    C.
    space lattice
    D.
    none of these

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  13. Which of the following statement is incorrect about duralumin?

  14. A.
    It is prone to age hardening
    B.
    It can be forged
    C.
    It has good machining properties
    D.
    It is lighter than pure aluminium

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  15. The property of a material which enables it to retain the deformation permanently, is called

  16. A.
    brittleness
    B.
    ductility
    C.
    malleability
    D.
    plasticity

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  17. Sulphur in cast iron

  18. A.
    makes the iron soft and easily machinable
    B.
    increases hardness and brittleness
    C.
    makes the iron white and hard
    D.
    aids fusibility and fluidity

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  19. Cementite consist of

  20. A.
    13% carbon and 87% ferrite
    B.
    13% cementite and 87% ferrite
    C.
    13% ferrite and 87% cementite
    D.
    6.67% carbon and 93.33% iron

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