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Mechanical Engineering :: Engineering Materials

  1. Micro-structure of a material is, generally, examined by

  2. A.
    naked eye
    B.
    optical microscope
    C.
    X-ray techniques
    D.
    none of these

  3. The addition of magnesium to cast iron increases its

  4. A.
    hardness
    B.
    ductility and strength in tension
    C.
    corrosion resistance
    D.
    creep strength

  5. Killed steels

  6. A.
    have minimum impurity level
    B.
    are produced by L-D process
    C.
    have almost zero percentage of phosphorus and sulphur
    D.
    are free from oxygen

  7. The slow cooling of steel from the __________ results in a coarse grained structure.

  8. A.
    lower critical point
    B.
    upper critical point

  9. Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from austenitic state?

  10. A.
    Ferrite and pearlite
    B.
    Cementite and pearlite
    C.
    Ferrite and bainite
    D.
    Cementite and martensite

  11. A steel with 0.8% carbon and 100% pearlite is called

  12. A.
    eutectoid steel
    B.
    hypo-eutectoid steel
    C.
    hyper-eutectoid steel
    D.
    none of these

  13. 18/8 stainless steel consists of

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

  15. Vanadium when added to steel

  16. A.
    increases tensile strength
    B.
    decreases tensile strength
    C.
    raises critical temperature
    D.
    Sowers critical temperature

  17. The limestone in the charge of a blast furnace decomposes to give lime and carbon dioxide. The lime thus obtained

  18. A.
    controls the grade of pig iron
    B.
    acts as an iron-bearing mineral
    C.
    supplies heat to reduce ore and melt the iron
    D.
    forms a slag by combining with impurities

  19. During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising.

  20. A.
    Agree
    B.
    Disagree