Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Discussion Forum : UPSC Civil Service Exam Questions - Section 23 (Q.No. 3)
Which one of the following methods is generally considered the best for tunnel ventilation ?
Driving a drift through the tunnel
'Blow in' method
'Blow out' method
Combination of 'Blow in' and 'Blow out' methods
Answer: Option
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