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Fire in fuel gas pipelines is extinguished most effectively by

A. Spraying water

B. Blanketting the area with nitrogen atmosphere

C. Fire fighting foam

D. None of these

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. Brinell Hardness Number (BHN) for talc is approximately in the range of
  2. __________ is the process used for setting up compressive stresses in the surface of a metal to improve…
  3. The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log…
  4. Normalising does not __________ of a metal.
  5. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e.…
  6. Powder metallurgy technique is used in the production of __________ tools.
  7. The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
  8. Principal alloying element in Elinvar (used for making hair springs for watches) is
  9. Fatigue limit improvement by over stressing the metal by successively increasing the load is called…
  10. __________ fluid force is not considered in the Navier-Stokes equation.
  11. Most of the phosphorous present in the blast furnace burden enters into
  12. Fog is an example of colloidal system of
  13. The phenomenon occurring during explosion of a hydrogen bomb is
  14. Which of the following is not a principal alloying element for the structural steel?
  15. The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.
  16. Fahrenheit and Centigrade scales have the same readings at
  17. Pick out the wrong statement.
  18. __________ can replace tungsten in high speed steel.
  19. Dislocations are __________ defects.
  20. Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
  21. Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing…
  22. Induced draft fans provided in large thermal power plant boilers have __________ blades.
  23. The pressure outside a bubble/droplet of liquid is __________ the internal pressure.
  24. Function of fusible plug in a boiler is to
  25. Nitriding of a steel part does not increase its
  26. If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
  27. Holes for riveting purposes should be preferably made by
  28. In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just…
  29. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts…
  30. The following type of bonding is strongly directional in solids.