Tunnelling problems
- 1. In the given figure drill holes, heading, mucking and benching are mumbered as 1, 2, 3, 4 The correct sequence is :
Options- A. 4 1 2 3
- B. 1 2 3 4
- C. 4 1 3 2
- D. 3 4 1 3 Discuss
Correct Answer: 4 1 3 2
- 2. The advantages of providing a pair of tunnels as compared to only one large highway tunnel is :
Options- 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. Discuss
Correct Answer: All the above.
- 3. For full face method, the excavation to be done is generally divided into
Options- A. two sections
- B. three sections
- C. four sections
- D. five sections. Discuss
Correct Answer: three sections
- 4. The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than
Options- A. 200 particles/cm3
- B. 250 particles/cm3
- C. 300 particles/cm3
- D. 450 particles/cm3
- E. 400 particles/cm3 Discuss
Correct Answer: 450 particles/cm3
- 5. A tunnel is found more advantageous as compared to the alternate routes because it:
Options- A. remains free from snow
- B. reduces the cost by reducing the route distance
- C. reduces the maintenance cost
- D. avoids interference with surface rights
- E. All the above. Discuss
Correct Answer: All the above.
- 6. In case of railways,
Options- A. a detour round the hill is preferred
- B. a open cut is preferred
- C. tunnelling is preferred
- D. All the above. Discuss
Correct Answer: tunnelling is preferred
- 7. 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 :
Options- A. 1 2 3 4 5
- B. 2 3 5 4 1
- C. 4 2 1 3 5
- D. 2 3 1 4 5 Discuss
Correct Answer: 2 3 1 4 5
- 8. Pick up the correct statement from the following:
Options- A. The topographical maps of the Survey of India are useful in the mountainous region for tunnelling.
- B. The height point on the ridge is fixed with the help of reciprocal ranging
- C. The accuracy of 1 in 10, 000 is required for planimetric control
- D. 1 second theodolite is used for angular measurement to achieve an angular error of 15 N where N is number of angles
- E. All the above. Discuss
Correct Answer: All the above.
- 9. Which one of the following methods is adopted for permanent drainage of tunnels :
Options- A. provision of longitudinal drains
- B. continuous open drains
- C. concrete lining
- D. grouting with cement or chemicals
- E. All the above. Discuss
Correct Answer: All the above.
- 10. For B.G. single track, the section of the tunnel must have a width
Options- A. 4.2 m to 4.5 m
- B. 4.5 m to 4.8 m
- C. 4.9 m to 5.5 m
- D. 5.5 m to 5.8 m Discuss
Correct Answer: 4.9 m to 5.5 m
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