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- Question
For tunnels exceeding 300 m in length, the grade should be provided below
Options- A. 50% of the ruling gradient
- B. 60% of the ruling gradient
- C. 75% of the ruling gradient
- D. 80% of the ruling gradient.
- Correct Answer
- 75% of the ruling gradient
- 1. Pick up the correct statement regarding drilling a tunnel from the following:
Options- A. Holes are drilled by pneumatically operated rock drills
- B. One drill is required for each 4 to 5 m2 force area
- C. The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
- D. All of the above. Discuss
- 2. The method of draining in the tunnels, is generally known as
Options- A. foredrainage
- B. dewatering
- C. permanent drainage
- D. All of the above. Discuss
- 3. The following operations are generally employed for tunnelling in hard rock.
1. Removing ground water,
2. Loading holes and firing the explosive
3. Setting up and drilling
4. Grouting and lining
5. Removing muck
6. Ventilation and removing explosion dust
The correct sequence is :
Options- A. 3 2 6 5 1 4
- B. 3 4 6 1 5 2
- C. 4 1 2 3 6 5
- D. 5 4 2 1 3 6 Discuss
- 4. Which one of the following statements is not correct for heading and benching method of tunnelling?
Options- A. Drilling and mucking can be done simultaneously
- B. Benching provides a plateform for working on heading
- C. Removal of muck from the heading is very easy
- D. None of these. Discuss
- 5. Which one of the following methods of tunnelling does not require the use of time bearing :
Options- A. Linear plate method
- B. Shield method
- C. Compressed air method
- D. Mechanical tunneler i.e. mole method
- E. All the these. Discuss
- 6. Railway tunnels, are generally
Options- A. polycentric
- B. rectangular
- C. parabolic
- D. circular
- E. none of these. Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Tunnelling problems
Search Results
Correct Answer: All of the above.
Correct Answer: All of the above.
Correct Answer: 3 2 6 5 1 4
Correct Answer: Removal of muck from the heading is very easy
Correct Answer: All the these.
Correct Answer: polycentric
Correct Answer: 4 1 3 2
Correct Answer: All the above.
Correct Answer: three sections
Correct Answer: 450 particles/cm3
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