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  1. In the middle part of the blast furnace (zone of absorption), 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. The temperature in the upper part of the blast furnace (zone of reduction) is __________ that of the middle part.

  4. A.
    equal to
    B.
    less than
    C.
    more than

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  5. The temperature point at which the change starts on heating the steel is called

  6. A.
    lower critical point
    B.
    upper critical point
    C.
    point of recalescence
    D.
    point of decalescence

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  7. Aluminium bronze has high resistance to corrosion.

  8. A.
    True
    B.
    False

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  9. Manganese bronze contains more copper than silicon bronze.

  10. A.
    Yes
    B.
    No

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  11. In a face centred cubic space lattice, there are

  12. A.
    nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre
    B.
    fourteen atoms out of which eight atoms are located at the corners of the cube and six atoms at the centres of six faces
    C.
    seventeen atoms out of which twelve atoms are located at the twelve corners of the hexagonal prism, one atom at the centre of each of the two hexagonal faces and three atoms are symmetrically arranged in the body of the cell
    D.
    none of the above

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  13. The fuel used in a blast furnace is

  14. A.
    coal
    B.
    coke
    C.
    wood
    D.
    producer gas

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  15. Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel.

  16. A.
    True
    B.
    False

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  17. Which of the following is a point imperfection?

  18. A.
    Vacancy
    B.
    Interstitial imperfection
    C.
    Frenkel imperfection
    D.
    all of these

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  19. The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as

  20. A.
    carburising
    B.
    cyaniding
    C.
    flame hardening
    D.
    induction hardening

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