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Mechanical Engineering :: Engineering Materials

  1. Which of the following is a case hardening process?

  2. A.
    Carburising
    B.
    Cyaniding
    C.
    Nitriding
    D.
    all of these

  3. In a crystalline material, atoms are arranged in definite and orderly manner and form.

  4. A.
    Agree
    B.
    Disagree

  5. The austenitic stainless steel contains

  6. A.
    18% chromium and 8% nickel
    B.
    8% chromium and 18% nickel
    C.
    14% chromium and 0.35% carbon
    D.
    14% nickel and 0.35% carbon

  7. The process used for relieving the internal stresses previously set up in the Metal and for increasing the machinability of steel, is

  8. A.
    normalising
    B.
    full annealing
    C.
    process annealing
    D.
    spheroidising

  9. Steel containing upto 0.15% carbon, is known as

  10. A.
    mild steel
    B.
    dead mild steel
    C.
    medium carbon steel
    D.
    high carbon steel

  11. In a unit cell of a body centred cubic space lattice, there are __________ atoms.

  12. A.
    six
    B.
    nine
    C.
    fourteen
    D.
    seventeen

  13. Cast iron has

  14. A.
    high compressive strength
    B.
    excellent machinability
    C.
    good casting characteristic
    D.
    all of these

  15. The nuts and bolts are made from silicon steel.

  16. A.
    Correct
    B.
    Incorrect

  17. Silicon 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

  19. The process which improves the machinability of steels, but lowers the hardness and tensile strength, is

  20. A.
    normalising
    B.
    full annealing
    C.
    process annealing
    D.
    spheroidising