Question Paper

1)Which one of the following statements is not correct for heading and benching method of tunneling ?

 A. Drilling and mucking can be done simultaneously

 B. Benching provides a platform for working on heading

 C. Removal of muck from the heading is very easy 

 D. None of these.

2)The difference of heights of the tunnels above rail tops of BG and MG tracks is kept 

A. 0.30 m

B. 0.45 m 

C. 0.60 m

D. 0.75 m

3) In case of drift method of tunneling, the drift may be excavated at

 A. the centre

 B. the bottom

 C. the top

 D. the side

 E. All of the above

 4) A tunnel is found more advantageous as compared to the alternate routes because it:

 A. remains free from snow

 B. reduces the cost by reducing the route distance

 C. reduces the maintenance cost 

 D. avoids interference with surface rights 

 E. All the above. 

5) For B.G. single track railway, the height of the tunnel above top of rails should be

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 

6) Pick up the correct statement regarding drilling a tunnel from the following:

A. Holes are drilled by pneumatically operated rock drills 

B. One drill is required for each 4 to 5m2 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.

7)For tunnels exceeding 300 m in length, the grade should be provided below

A. 50% of the ruling gradient 

B. 60% of the ruling gradient 

C. 75% of the ruling gradient 

D. 80% of the ruling gradient.

8)The method of draining in the tunnels, is generally known as

A. fore drainage 

B. dewatering 

C. permanent drainage 

D. All of the above.

9) Pick up the correct statement from the following during tunnel excavation,

A. Oxygen should not be less than 19.5%

B. Carbon dioxide 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

10)To attain the required shape of the tunnel section, we use

A. easiers

B. trimmers 

C. cut holes 

D. chisels.

11)The most commonly adopted pattern of cut holes is

A. horizontal wedge cut 

B. pyramid cut 

C. fan cut 

D. V-cut 

E. All the above

12)Which one of the following linings is suitable for shield driven tunnels particularly in the subaqueous regions

A. Brick lining 

B. stone lining 

C. timber line 

D. cast iron lining 

E. concrete lining. 

13)In case of railways

A. a detour round the hill is preferred 

B. a open cut is preferred 

C. tunnelling is preferred 

D. All the above.

14)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:

A. 4 1 3 2 

B. 1 4 2 3 

C. 2 3 1 4

D. 3 2 4 1 

15)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 :

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

16)Pick up the mechanical ventilation method used for tunnels from the following

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

17)Which one of the following methods of tunnelling does not require the use of time bearing

A. Linear plate method 

B. Shield method 

C. Compressed air method 

D. Mechanical tunneler i.e. mole method 

E. All the these.

18)For highways, tunnelling is preferred to if the open cut exceeds

A. 10 metres depth

B. 15 metres depth 

C. 20 metres depth 

D. 25 metres depth.

19) The following operations are required for tunnelling in rocky terrain : 

1. Removing the foul gases 

2. Marking the tunnel profile 

3. Setting up and drilling 

4. Checking misfire 

5. Mucking 

The correct sequence is 

A. 1 2 3 4 5 

B. 2 3 5 4 1 

C. 4 2 1 3 5 

D. 2 3 1 4 5 

The advantages of providing a pair of tunnels as compared to only one large highway tunnel is :

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.

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