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Chemical Engineering :: Materials and Construction

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

  2. A.
    dilute HC1
    B.
    acetic acid
    C.
    concentrated H2SO4
    D.
    none of these

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  3. An alloy of iron containing 4% carbon is called

  4. A.
    high carbon steel
    B.
    wrought iron
    C.
    mild steel
    D.
    none of these

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  5. Steel pipes are normally manufactured by __________ process.

  6. A.
    extrusion
    B.
    cold working
    C.
    forging
    D.
    electroforming

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  7. Polymorphism is not exhibited by

  8. A.
    carbon
    B.
    iron
    C.
    phosphorous
    D.
    none of these

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  9. Rubber lined vessels are corroded by the action of

  10. A.
    aqua regia
    B.
    chloroform
    C.
    sulphuric acid (95%)
    D.
    all (a), (b) and (c)

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  11. __________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.

  12. A.
    Solid solution hardening
    B.
    Screw dislocation
    C.
    Strain ageing
    D.
    Twinning

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  13. Which of the following metals in not used for coating of the base metal to guard it against corrosion ?

  14. A.
    Lead
    B.
    Cadmium
    C.
    Magnesium
    D.
    Aluminium

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  15. Brass container is suitable for storing

  16. A.
    aqueous ammonia
    B.
    beer
    C.
    H2SO4(95%)
    D.
    phosphoric acid (95%)

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  17. Aqueous nitric acid is stored in __________ vessel.

  18. A.
    plain carbon steel
    B.
    stainless steel
    C.
    cast iron
    D.
    thermosetting plastic material

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  19. A metallic alloy in which one of the constituent metal is __________ , is called an amalgam.

  20. A.
    zinc
    B.
    mercury
    C.
    lead
    D.
    tin

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