Gas Measurement and Safety Quiz

The permissible limit of the H2S is ?

• 10 ppm

• 50 ppm

• 7 ppm

• 5 ppm

The permissible limit of the SO2 is ?

• 10 ppm

• 50 ppm

• 7 ppm

• 5 ppm

When mixed with air H2 forms on explosive mixture the limits of explosibility is ?

• 5 - 15

• 4.3 - 45

• 12 - 75

• 4 - 75

The permissible limit for the nitrous fumes is?

• 10 ppm

• 50 ppm

• 7 ppm

• 5 ppm

Methane gas is also called as?

• stink damp

• Marsh gas

• choke damp

• white damp

Methane can be found at?

• roof

• floor

• Any place in the roadway

• Exhaust gases of the locomotive

M.S.A methanometer is worked on the principle of?

• Formation of gas cap

• Wheatstone bridge

• Infraradiation

• Optical properties

Spiralaram is worked on the principle of?

• Formation of gas cap

• Wheatstone bridge

• Infraradiation

• Optical properties

Ring rose detector works on the principle of?

• Formation of gas cap

• Wheatstone bridge

• Diffusion-combustion-contraction

• Optical properties

Interferometers works on the principle of?

• Formation of gas cap

• Wheatstone bridge

• Infraradiation

• Optical