Civil Engineering - Tunnelling

Exercise :: Tunnelling - Section 1

  • Tunnelling - Section 1
16. 

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

Explanation:

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17. 

Which one of the following methods of tunnelling does not require the use of time bearing :

A. Linear plate method
B. Shield method
C. Compressed air method
D. Mechanical tunneler i.e. mole method
E. All the these.

Answer: Option E

Explanation:

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18. 

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

A. 10 metres depth
B. 15 metres depth
C. 20 metres depth
D. 25 metres depth.

Answer: Option B

Explanation:

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19. 

The following operations are required for tunnelling in rocky terrain :
1. Removing the foul gases
2. Marking the tunnel profile
3. Setting up and drilling
4. Checking misfire
5. Mucking
The correct sequence is :

A. 1 2 3 4 5
B. 2 3 5 4 1
C. 4 2 1 3 5
D. 2 3 1 4 5

Answer: Option D

Explanation:

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20. 

The advantages of providing a pair of tunnels as compared to only one large highway tunnel is :

A. economy in cost of construction
B. avoidance of head on collisions
C. provision of separate exit and entrance of two traffic streams
D. facility in carrying out repairs
E. All the above.

Answer: Option E

Explanation:

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