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Mechanical Engineering :: Engineering Materials

  1. The bond formed by transferring electrons from one atom to another is called

  2. A.
    ionic bond
    B.
    covalent bond
    C.
    metallic bond
    D.
    none of these

  3. Which of the following property is desirable in parts subjected to shock and impact loads?

  4. A.
    Strength
    B.
    Stiffness
    C.
    Brittleness
    D.
    Toughness

  5. German silver contains

  6. A.
    1% silver
    B.
    2% silver
    C.
    5% silver
    D.
    no silver

  7. Connecting rod is, usually, made from

  8. A.
    low carbon steel
    B.
    high carbon steel
    C.
    medium carbon steel
    D.
    high speed steel

  9. Which of the following inpurity in cast iron makes it hard and brittle?

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

  11. There are fourteen atoms in a unit cell of

  12. A.
    body centred cubic space lattice
    B.
    face centred cubic space lattice
    C.
    close packed hexagonal space lattice
    D.
    none of these

  13. The maximum internal diameter of a blast furnace is about

  14. A.
    3 m
    B.
    6 m
    C.
    9 m
    D.
    12 m

  15. In spheroidising process, the steel is

  16. A.
    heated below the lower critical temperature and then cooled slowly
    B.
    heated upto the lower critical temperature and then cooled in still air
    C.
    heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
    D.
    none of the above

  17. Pearlite is a combination of 87% ferrite and 13% cementite.

  18. A.
    Yes
    B.
    No

  19. The percentage carbon content in wrought iron is about

  20. A.
    0.02
    B.
    0.1
    C.
    02
    D.
    0.4