Tunnelling problems
- 1. For hauling muck from the tunnel, the following type of muck-car is used :
Options- A. muck box
- B. balle-ship
- C. side dump car
- D. U-bottom
- E. All of these. Discuss
Correct Answer: All of these.
- 2. In case of drift method of tunnelling, the drift may be excavated at
Options- A. the centre
- B. the bottom
- C. the top
- D. the side
- E. All of the above. Discuss
Correct Answer: All of the above.
- 3. Which one of the following methods is generally used for the layout of the muck-car tracks
Options- A. the grass hopper method
- B. passing track method
- C. the cherry picker
- D. California crossing, Dixon conveyor
- E. All the above. Discuss
Correct Answer: All the above.
- 4. 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
Correct Answer: All the these.
- 5. 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
Correct Answer: Removal of muck from the heading is very easy
- 6. 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
Correct Answer: 3 2 6 5 1 4
- 7. 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
Correct Answer: All of the above.
- 8. 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
Correct Answer: All of the above.
- 9. 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. Discuss
Correct Answer: 75% of the ruling gradient
- 10. Railway tunnels, are generally
Options- A. polycentric
- B. rectangular
- C. parabolic
- D. circular
- E. none of these. Discuss
Correct Answer: polycentric
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