Discussion
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- Question
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
- Correct Answer
- 1 2 3 4
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. Pick up the mechanical ventilation method used for tunnels from the following:
Options- 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. Discuss
- 8. In the wooded bulk-head, used for mucking in steep grade tunnels,
Options- A. one opening is provided
- B. two openings are provided
- C. three openings are provided
- D. no opening is provided. Discuss
- 9. Concrete lining is provided concurrently with the driving operation in case of
Options- A. rock terrain
- B. soft rock
- C. running soil
- D. none of these. Discuss
- 10. Pick up the correct statement from the following during tunnel excavation,
Options- A. Oxygen should not be less than 19.5%
- B. Carbondioxide should not be more than 0.5%
- C. Hydrogen sulphide should not be more than 0.001%
- D. Carbon mono-oxide should not be more than 0.01%
- E. All of the above. Discuss
Tunnelling problems
Search Results
Correct Answer: 6.7 m to 7.3 m
Correct Answer: the grass hopper method
Correct Answer: 4.9 m to 5.5 m
Correct Answer: All the above.
Correct Answer: All the above.
Correct Answer: 3 2 4 1
Correct Answer: all the above.
Correct Answer: two openings are provided
Correct Answer: rock terrain
Correct Answer: All of the above.
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