Question 151. Pick up the correct statement from the following during tunnel excavation,

Question 152. In case of railways,

Question 153. The following operations are generally employed for tunnelling in hard rock.
1. Removing ground water.
2. Loading holes and firing the explosive
3. Setting up and drilling
4. Grouting and lining
5. Removing muck
6. Ventilation and removing explosion dust
The correct sequence is :

Question 154. The following tunnels were constructed in different countries for different purposes :
1. Emperor Claudius built the first Roman tunnel
2. The first highway tunnel was constructed in Hungary
3. The first underground railway tunnel was constructed in Great Britain
4. The first navigational tunnel was constructed in France.
The correct chronological development of these tunnels is:

Question 155.   The following tunnels were constructed in different countries for different purposes : 1. Emperor Claudius built the first Roman tunnel 2. The first highway tunnel was constructed in Hungary 3. The first underground railway tunnel was constructed in Great Britain 4. The first navigational tunnel was constructed in France. The correct chronological development of these tunnels is:

Question 156.  The tunnels, the artificial underground passages are constructed for

Question 157.  For highways, tunnelling is preferred to if the open cut exceeds :

Question 158.   A tunnel is found more advantageous as compared to the alternate routes because it :

Question 159.  In case of railways,

Question 160.   Pick up the correct statement from the following :