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  1. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

  2. A.
    2
    B.
    5
    C.
    10
    D.
    20

  3. Which set of materials is used as a moderator in nuclear reactor ?

  4. A.
    Zircalloy & berrylium.
    B.
    Zircalloy & heavy water.
    C.
    Zirconium & berrylium.
    D.
    Heavy water & berrelium.

  5. Malleabilisation heat treatment is performed on

  6. A.
    cast steel
    B.
    grey cast iron
    C.
    white cast iron
    D.
    spheroidal graphite cast iron

  7. For hardening high alloy steel, it is to be heated slowly and uniformly to avoid

  8. A.
    local hardening
    B.
    scale formation
    C.
    segregation
    D.
    warpage

  9. Disposable patterns are made of

  10. A.
    metal
    B.
    polystyrene
    C.
    rubber
    D.
    wood

  11. The type of water filter normally employed/ preferred for treating small quantities of water in railway stations and individual industries is the __________ filter.

  12. A.
    rapid sand
    B.
    pressure
    C.
    gravity
    D.
    slow sand.

  13. The radioactive isotope of hydrogen is

  14. A.
    deuterium
    B.
    tritium
    C.
    protium
    D.
    none of these

  15. Refrigerative cooling employed during long distance transportation of food stuffs is normally done by

  16. A.
    ice
    B.
    liquid nitrogen
    C.
    liquid oxygen
    D.
    vacuum evaporation

  17. Internal cracks in drawn bars are due to

  18. A.
    secondary tensile stresses.
    B.
    temperature gradient in the work piece.
    C.
    heated dies and grips.
    D.
    internal compressive residual stress.

  19. Yield strength of a polycrystalline metal with an average grain size, d, is proportional to

  20. A.
    d1/2
    B.
    d-1/2
    C.
    d
    D.
    d-1