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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. The main purpose of galvanising iron sheets is to

    2. A.
    harden the surface.
    B.
    increase its glossiness and lustre.
    C.
    prevent the action of water.
    D.
    prevent the action of oxygen.

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  2. The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.

    3. A.
    0.2
    B.
    2
    C.
    4
    D.
    8

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  3. Invar used in thermocouples is an alloy of nickel and

    4. A.
    iron
    B.
    copper
    C.
    chromium
    D.
    lead

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  4. Nickel (56%) and molybdenum (17%) alloys are called

    5. A.
    monel
    B.
    hastealloy C
    C.
    inconel
    D.
    bronzes

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  5. Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by

    6. A.
    dilute HCI
    B.
    acetic acid
    C.
    concentrated H2SO4
    D.
    none of these

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  6. Constituents of stellite are

    7. A.
    zinc, copper and nickel.
    B.
    cobalt, chromium and tungsten.
    C.
    zinc, aluminium and nickel.
    D.
    nickel, cobalt and vanadium.

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  7. Residual magnetism in steel for magnets is increased by the addition of

    8. A.
    nickel
    B.
    cobalt
    C.
    tungsten
    D.
    chromium

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  8. Presence of nickel in steel improves its

    9. A.
    corrosion resistance.
    B.
    cutting ability.
    C.
    wear resistance.
    D.
    all (a), (b) and (c).

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  9. Cementite is

    10. A.
    Fe3C chemically.
    B.
    a compound of carbon and iron.
    C.
    characterised by an orthorhombic crystal structure.
    D.
    all (a), (b) and (c).

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  10. Acetylene gas holder is made of

    11. A.
    copper
    B.
    cast iron
    C.
    steel
    D.
    monel metal

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