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Chemical Engineering :: Materials and Construction

Materials and Construction - Section 1
Materials and Construction - Section 2
Materials and Construction - Section 3
Materials and Construction - Section 4
Materials and Construction - Section 5
Materials and Construction - Section 6
Materials and Construction - Section 7
Materials and Construction - Section 8
Materials and Construction - Section 9
Materials and Construction - Section 10
Materials and Construction - Section 11

  1. 'Age hardening' of duralumin is due to

    2. A.
    copper
    B.
    magnesium
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  2. __________ is a donor impurity for semi-conductors.

    3. A.
    Boron
    B.
    Antimony
    C.
    Gallium
    D.
    none of these

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  3. Post weld heat treatment is done by

    4. A.
    normalising
    B.
    stress relieving
    C.
    tempering
    D.
    solution annealing

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  4. How many atoms are there per unit cell in a body centred cubic lattice system ?

    5. A.
    2
    B.
    3
    C.
    4
    D.
    6

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  5. Presence of cobalt in steel improves its

    6. A.
    cutting ability
    B.
    corrosion resistance
    C.
    tensile strength
    D.
    none of these

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  6. In cold working of metal as compared to its hot working

    7. A.
    cracks and blow holes are eliminated.
    B.
    ductility and impact strength improves.
    C.
    appreciable strain hardening is produced.
    D.
    yield stress, hardness and fatigue strength is not at all affected.

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  7. Nickel base alloys with __________ are known as monel metal.

    8. A.
    zinc
    B.
    tin
    C.
    copper
    D.
    molybdenum

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  8. Wrought iron is having very high

    9. A.
    hardness.
    B.
    strength.
    C.
    corrosion resistance.
    D.
    susceptibility to changes in its properties by heat treatment.

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  9. When iron is rusted, it is

    10. A.
    converted to a fine powder
    B.
    reduced
    C.
    oxidised
    D.
    none of these

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  10. Containers made of high silicon cast iron (14% Si) are not suitable for the storage of

    11. A.
    acetic acid.
    B.
    benzoic & boric acids.
    C.
    phosphoric acid (95%) & sulphuric acid (95%).
    D.
    hydrochloric acid (concentrated).

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