Which of the following lining material is useful for shield driven tunnels in sub aqueous regions?
Which of the following lining material is useful for shield driven tunnels in sub aqueous regions?
The tunnels, the artificial underground passages are constructed for:
The tunnels, the artificial underground passages are constructed for:
Drifters can be used to drill
Drifters can be used to drill
Which of the following are percussion drills?
(i) Shot drill
(ii) Diamond drill
(iii) Wagon drill
(iv) Churn drill
Which of the following are percussion drills?
(i) Shot drill
(ii) Diamond drill
(iii) Wagon drill
(iv) Churn drill
Which of the following methods of tunneling is used for long tunnels at great depths?
Which of the following methods of tunneling is used for long tunnels at great depths?
