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Engineering Materials - Section 5
Engineering Materials - Section 6

  1. Admirality gun metal contains

    2. A.
    60% copper, 35% zinc and 5% manganese
    B.
    76% copper, 20% silicon and 4% zinc
    C.
    82% copper, 12% zinc and 6% manganese
    D.
    88% copper, 10% tin and 2% zinc

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  2. The percentage of phosphorus is phosphor bronze is

    3. A.
    0.1
    B.
    1
    C.
    11.1
    D.
    98

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  3. In high speed steels, vanadium adds to the property of red hardness and tungsten and chromium add to high wear resistance.

    4. A.
    True
    B.
    False

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  4. For the pipe fitting like elbow, tee, union etc., which of the following is preferred?

    5. A.
    Pig iron
    B.
    Malleable iron
    C.
    Spheroidal graphite cast iron
    D.
    High carbon steel

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  5. Chilled cast iron is produced

    6. A.
    by adding magnesium to molten cast iron
    B.
    by quick cooling of molten cast iron
    C.
    from white cast iron by annealing process
    D.
    none of these

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  6. Silicon is added in low carbon steels to

    7. A.
    make the steel tougher and harder
    B.
    make the steel of good bending qualities
    C.
    raise the yield point
    D.
    all of these

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  7. According to Indian standard specifications, cast iron designated by 'FG 150' means

    8. A.
    white cast iron with B.H.N. 150
    B.
    white cast iron with 150 MPa as minimum compressive strength
    C.
    grey cast iron with B.H.N. 150
    D.
    grey cast iron with 150 MPa as minimum tensile strength

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  8. The red flame during the operation of a bessemer converter indicates that the

    9. A.
    air is burning out silicon and manganese
    B.
    silicon and manganese has burned out and carbon has started oxidising
    C.
    converter must be tilted to remove the contents of the converter
    D.
    red flame does not occur during the operation of a bessemer converter

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  9. Phosphor bronze has

    10. A.
    high resistance to corrosion
    B.
    good wearing qualities and high elasticity
    C.
    valuable cold working property
    D.
    all of these

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  10. In the austempering process of heat treatment, austenite changes into

    11. A.
    martensite
    B.
    troostite
    C.
    sorbite
    D.
    bainite

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