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Mechanical Engineering :: Engineering Materials

  1. Cast iron is a ductile material.

  2. A.
    Correct
    B.
    Incorrect

  3. Manganese is added in low carbon steel to

  4. A.
    make the steel tougher and harder
    B.
    raise the yield point
    C.
    make the steel ductile and of good bending qualities
    D.
    all of the above

  5. Beryllium bronze contains

  6. A.
    60% copper and 40% beryllium
    B.
    80% copper and 20% beryllium
    C.
    97.75% copper and 2.25% beryllium
    D.
    99% copper and 1% beryllium

  7. The portion of the blast furnace below its widest cross-section is called

  8. A.
    hearth
    B.
    stack
    C.
    bosh
    D.
    throat

  9. Gamma-iron occurs between the temperature range of

  10. A.
    400°C to 600°C
    B.
    600°C to 900°C
    C.
    900°C to 1400°C
    D.
    1400°C to 1530°C

  11. When filing or machining cast iron makes our hands black, then it shows that __________ is present in cast iron.

  12. A.
    cementite
    B.
    free graphite

  13. According to Indian standard specifications, a plain carbon steel designated by 40 C8 means that the carbon content is

  14. A.
    0.04%
    B.
    0.35 to 0.45%
    C.
    0.4 to 0.6%
    D.
    0.6 to 0.8%

  15. Wrought iron

  16. A.
    is a ductile material
    B.
    can be easily forged or welded
    C.
    cannot stand sudden and excessive shocks
    D.
    all of these

  17. In iron, the presence of carbon in free form is called graphite.

  18. A.
    Agree
    B.
    Disagree

  19. In a body centred cubic space lattice, there are nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre.

  20. A.
    Yes
    B.
    No