Discussion
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- Question
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.
- Correct Answer
- All the above.
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. An overhead track on a large truss frame is required in case of car changer by
Options- A. the grass hopper method
- B. the passing track method
- C. California crossing method
- D. Dixon conveyor method. Discuss
- 8. For B.G. single track railway, the height of the tunnel above top of rails should be
Options- A. 5.5 m to 5.8 m
- B. 5.8 m to 6.2 m
- C. 6.7 m to 7.3 m
- D. 7.3 m to 7.5 m Discuss
- 9. For transferring the tunnel alignment through shafts, we adopt the following steps :
1. Hanging two or more plumb lines in the shaft
2. Determining the bearing of the plumb lines i.e. plumb plane
3. Suspending a 35 kg weight by each plumb line
4. Immersing the weights of both the plumb lines in the buckets containing water.
The correct sequence of steps is :
Options- A. 1 2 3 4
- B. 4 3 2 1
- C. l 3 2 4
- D. 2 1 4 3 Discuss
- 10. For initial surveys of tunnels, the following activities are involved:
1. Marking portal point with concrete pillars on the ground
2. Marking tunnel obligatory points on the topographical maps
3. Preliminary setting of the tunnel on the topographical Survey of India maps
3. Driving lines between the fixed obligatory points.
The correct sequence of the activities is :
Options- A. 3 2 4 1
- B. 1 2 3 4
- C. 4 3 1 2
- D. 2 4 3 1 Discuss
Tunnelling problems
Search Results
Correct Answer: All the above.
Correct Answer: 2 3 1 4 5
Correct Answer: tunnelling is preferred
Correct Answer: All the above.
Correct Answer: 450 particles/cm3
Correct Answer: 4.9 m to 5.5 m
Correct Answer: the grass hopper method
Correct Answer: 6.7 m to 7.3 m
Correct Answer: 1 2 3 4
Correct Answer: 3 2 4 1
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