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  1. Coating provided on the electrodes used in the arc welding is not expected to

  2. A.
    add alloying elements.
    B.
    prevent electrode from contamination.
    C.
    stabilise the arc.
    D.
    provide protective atmosphere to weld.

  3. Desalination of water

  4. A.
    makes it potable.
    B.
    makes it non-potable.
    C.
    means distillation of water.
    D.
    none of these.

  5. Viscoelastic behaviour is observed in __________ materials.

  6. A.
    non-crystalline organic polymeric
    B.
    ceramic
    C.
    all crystalline
    D.
    all amorphous

  7. Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation

  8. A.
    pressure falls below the vapour pressure
    B.
    pressure becomes very high
    C.
    temperature becomes low
    D.
    all 'a', 'b' & 'c'

  9. Which of the following materials has the poorest electrical conductivity ?

  10. A.
    Carbon
    B.
    Aluminium
    C.
    Silver
    D.
    Stainless steel

  11. Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is

  12. A.
    black
    B.
    silver grey
    C.
    green
    D.
    yellow

  13. What is the percentage of chromium in 18-4-1 high speed steel ?

  14. A.
    1
    B.
    4
    C.
    18
    D.
    23

  15. Preheating before welding is done to

  16. A.
    make the plate softer.
    B.
    burn oil & grease sticking to plate surfaces.
    C.
    avoid plate distortion.
    D.
    prevent cold cracks.

  17. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

  18. A.
    1/k
    B.
    k
    C.
    k2
    D.
    1/k2

  19. Dew point temperature always gives an indication of the __________ of the moist air.

  20. A.
    dryness
    B.
    moisture content
    C.
    coolness
    D.
    latent heat