Pick up the mechanical ventilation method used for tunnels from the following:

Blowing fresh air by ducts to the face of tunnel

Exhausting foul air by ducts from the face of the tunnel and permitting fresh air through the tunnel

Blowing fresh air and exhausting foul air by ducts

All the above

Pick up the mechanical ventilation method used for tunnels from the following: Correct Answer All the above

Bissoy MCQ Team

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