Pick up the mechanical ventilation method used for tunnels from the following:
A. Blowing fresh air by ducts to the face of tunnel
B. Exhausting foul air by ducts from the face of the tunnel and permitting fresh air through the tunnel
C. Blowing fresh air and exhausting foul air by ducts
D. All the above
Answer: Option D
This Question Belongs to Civil Engineering >> Tunnel Engineering
A. (i) and (ii) are correct
B. (iii) and (iv) are correct
C. (i) and (iv) are correct
D. (ii) and (iii) are correct
Which of the following lining material is useful for shield driven tunnels in sub aqueous regions?
A. Stone masonry
B. Timber
C. Cast iron
D. Cement concrete
Which of the following methods of tunneling is used for long tunnels at great depths?
A. Army method
B. Needle beam method
C. Austrian method
D. English method
A. Only up holes
B. Only down holes
C. Horizontal or up holes
D. Horizontal down or up holes
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