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  1. Tin plated iron and galvanised iron are generally produced by

  2. A.
    vaporising
    B.
    hot dipping
    C.
    electroplating
    D.
    spraying

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  3. In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of

  4. A.
    stainless steel
    B.
    mild steel
    C.
    high speed steel
    D.
    high carbon steel

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  5. Dezincification is a form of corrosion espe-cially applicable to

  6. A.
    brass
    B.
    nichrome
    C.
    stainless steel
    D.
    monel

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  7. Which of the following materials is not suitable as a die material for wire drawing?

  8. A.
    Diamond
    B.
    Tungsten carbide
    C.
    Tool steel
    D.
    Bronze

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  9. By X-ray diffraction, it is not possible to determine the

  10. A.
    preferred orientation.
    B.
    residual localised stresses.
    C.
    particle size.
    D.
    ordered arrangement of magnetic moments.

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  11. In continuous casting process, graphite moulds are used with a view to providing

  12. A.
    heat resisting medium.
    B.
    self lubricating qualities.
    C.
    non-wetting surfaces.
    D.
    chilling effect.

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  13. Energy required to compress a hot gas as compared to cold gas will be

  14. A.
    more.
    B.
    less.
    C.
    same.
    D.
    more or less depending upon the nature of the gas.

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  15. In the commercial production of which of the following metals, matallothermic reduction is used ?

  16. A.
    Copper
    B.
    Zinc
    C.
    Zirconium
    D.
    Nickel

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  17. New water wells are disinfected with chlorine in the form of

  18. A.
    sodium chloride
    B.
    sodium hypochlorate
    C.
    bleaching powder
    D.
    aluminium chloride

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  19. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will

  20. A.
    decrease gradually.
    B.
    increase gradually.
    C.
    increase rapidly.
    D.
    remain constant.

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