Civil Engineering - UPSC Civil Service Exam Questions - Discussion

3. 

Which one of the following methods is generally considered the best for tunnel ventilation ?

[A]. Driving a drift through the tunnel
[B]. 'Blow in' method
[C]. 'Blow out' method
[D]. Combination of 'Blow in' and 'Blow out' methods

Answer: Option D

Explanation:

No answer description available for this question.

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