31. The formulae for finding density of air in kg/m3.
32. At what percentage of CO2, safety lamp begins to die down.
33. Nitrogen used for quenching . . . . . . . .
34. The fluid commonly used in 'U' tube manometer if more pressure difference.
35. Homalite is a mixture of
36. Flame safety lamp is also known as
37. The percentage of O2 percent in atmospheric air by volume.
38. Basing on shape of the blade the centrifugal fans classified into . . . . . . . . types.
39. Arrange and write the following parts of flame safety lamp from bottom to top
40. The difference in densities between two shafts may be produced by the following factors are
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