Tunnelling problems
- 1. Which one of the following linings is suitable for shield driven tunnels particularly in the subaqueous regions :
Options- A. Brick lining
- B. stone lining
- C. timber line
- D. cast iron lining
- E. concrete lining. Discuss
Correct Answer: cast iron lining
- 2. Pick up the explosive used for tunnelling in soft rocks from the following :
Options- A. blasting gelatine
- B. special gelatine
- C. ammonia dynamite
- D. semi-gelatine. Discuss
Correct Answer: ammonia dynamite
- 3. Which one of the following statements is not correct in respect of setting of an inclined tunnel:
Options- A. Reference points are constructed at every 300 m.
- B. The alignment is fixed from upper/lower apex point.
- C. The level of the invert at the heading is marked by a tape.
- D. Reference points are constructed on the roof of tunnels
- E. None the above. Discuss
Correct Answer: None the above.
- 4. To attain the required shape of the tunnel section, we use :
Options- A. easers
- B. trimmers
- C. cut holes
- D. chisels. Discuss
Correct Answer: trimmers
- 5. High pressure grouting is generally restored for concreting in the lining if the rock strata is:
Options- A. highly fissured
- B. poor
- C. likely to get seepage of water
- D. All of the above. Discuss
Correct Answer: All of the above.
- 6. The most commonly adopted pattern of cut holes is :
Options- A. horizontal wedge cut
- B. pyramid cut
- C. fan cut
- D. V-cut
- E. All the above. Discuss
Correct Answer: All the above.
- 7. For highways, tunnelling is preferred to if the open cut exceeds :
Options- A. 10 metres depth
- B. 15 metres depth
- C. 20 metres depth
- D. 25 metres depth. Discuss
Correct Answer: 15 metres depth
- 8. The cut of a tunnel face is shown in given figure. This is called
Options- A. Michigan cut
- B. Burn cut
- C. Fan cut
- D. Horizontal cut. Discuss
Correct Answer: Michigan cut
- 9. The tunnels, the artificial underground passages are constructed for :
Options- A. highways
- B. railways
- C. sewerage
- D. water supply project
- E. All the above. Discuss
Correct Answer: All the above.
- 10. The length of the needle beam used in needle beam method of tunnelling is usually
Options- A. 2 m to 4 m
- B. 2.5 m to 6 m
- C. 4 m to 7 m
- D. 5 m to 6 m Discuss
Correct Answer: 5 m to 6 m
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