Civil Engineering - Tunnelling - Discussion

Discussion Forum : Tunnelling - Section 1 (Q.No. 9)

Tunnelling

Pick up the correct statement from the following during tunnel excavation,

Oxygen should not be less than 19.5%

Carbondioxide should not be more than 0.5%

Hydrogen sulphide should not be more than 0.001%

Carbon mono-oxide should not be more than 0.01%

All of the above.

Answer: Option

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