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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

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  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

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  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

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

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

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  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

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  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

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  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

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  15. Vanadium when added to steel

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

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  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

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  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

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