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- Question
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.
- Correct Answer
- All of the above.
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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:
Options- A. 4 1 3 2
- B. 1 4 2 3
- C. 2 3 1 4
- D. 3 2 4 1 Discuss
- 7. Forepoling method is generally adopted for tunnelling in :
Options- A. soft ground
- B. firm ground
- C. running ground
- D. None of these. Discuss
- 8. The difference of heights of the tunnels above rail tops of BG and MG tracks is kept
Options- A. 0.30 m
- B. 0.45 m
- C. 0.60 m
- D. 0.75 m Discuss
- 9. Which one of the following methods is generally adopted for tunnelling in firm ground
Options- A. Full face method
- B. Top heading and benching method
- C. Drift method
- D. All the above. Discuss
- 10. Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.
Options- A. Driving of tunnel is done in two portions of its section
- B. Driving the top portion is done in advance of the bottom portion.
- C. After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench.
- D. The holes in head and bench are loaded together with explosive for blasting.
- E. Firing of head holes is done just before the bench holes are fired. Discuss
Tunnelling problems
Search Results
Correct Answer: rock terrain
Correct Answer: two openings are provided
Correct Answer: all the above.
Correct Answer: 3 2 4 1
Correct Answer: 1 2 3 4
Correct Answer: 1 4 2 3
Correct Answer: soft ground
Correct Answer: 0.60 m
Correct Answer: All the above.
Correct Answer: Firing of head holes is done just before the bench holes are fired.
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