Civil Engineering Tunneling Quiz (or) MCQ

1 .

Tunneling is required in case of _______

A)

Laying road

B)

Laying pavement

C)

Underground passage

D)

On ground passage

Correct Answer : Underground passage

Explanation : Tunnel can be defined as artificial underground passage, which is created for different purposes. It is required in case of highways, railways, sewerage and water supply.

2 .

Which one of the following methods is generally adopted for tunnelling in firm ground

A)

Full face method

B)

Drift method

C)

Top heading and benching method

D)

All of the above

Correct Answer : All of the above

3 .

Which one of the following statements is not correct for heading and benching method of tunnelling?

A)

Drilling and mucking can be done simultaneously

B)

Removal of muck from the heading is very easy

C)

Benching provides a plateform for working on heading

D)

None of the above

Correct Answer : Removal of muck from the heading is very easy

4 .

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

A)

0.75 m

B)

0.60 m

C)

0.45 m

D)

0.30 m

Correct Answer : 0.60 m

5 .

The most commonly adopted pattern of cut holes is :

A)

fan cut

B)

V-cut

C)

pyramid cut

D)

All of the above

Correct Answer : All of the above

Explanation : * fan cut
* V-cut
* pyramid cut
* horizontal wedge cut

6 .

Forepoling method is generally adopted for tunnelling in :

A)

soft ground

B)

firm ground

C)

running ground

D)

None of the above

Correct Answer : soft ground

7 .

Concrete lining is provided concurrently with the driving operation in case of

A)

soft rock

B)

running soil

C)

rock terrain

D)

None of the above

Correct Answer : rock terrain

8 .

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 5 mÂ² 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

Correct Answer : All of the above

9 .

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

A)

80% of the ruling gradient

B)

75% of the ruling gradient

C)

60% of the ruling gradient

D)

50% of the ruling gradient

Correct Answer : 75% of the ruling gradient

10 .

Which one of the following methods is generally used for the layout of the muck-car tracks

A)

the cherry picker

B)

the grass hopper method

C)

passing track method

D)

All of the above

Correct Answer : All of the above

Explanation : * the cherry picker
* the grass hopper method
* passing track method
* California crossing, Dixon conveyor

11 .

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 :

A)

1 2 3 4

B)

4 3 2 1

C)

1 3 2 4

D)

2 1 4 3

Correct Answer : 1 2 3 4

12 .

In the wooded bulk-head, used for mucking in steep grade tunnels,

A)

one opening is provided

B)

two openings are provided

C)

three openings are provided

D)

no opening is provided

Correct Answer : two openings are provided

13 .

Railway tunnels, are generally

A)

circular

B)

parabolic

C)

polycentric

D)

rectangular

Correct Answer : polycentric

14 .

Pick up the mechanical ventilation method used for tunnels from the following :

A)

blowing fresh air by ducts to the face of tunnel

B)

blowing fresh air and exhausting foul air by ducts

C)

exhausting foul air by ducts from the face of the tunnel and permitting fresh air through the tunnel

D)

All of the above

Correct Answer : All of the above

15 .

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

A)

Shield method

B)

Linear plate method

C)

Compressed air method

D)

All of the above

Correct Answer : All of the above

Explanation : * Shield method
* Linear plate method
* Compressed air method
* Mechanical tunneler i.e. mole method

16 .

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

Correct Answer : 15 metres depth

17 .

High pressure grouting is generally restored for concreting in the lining if the rock strata is :

A)

poor

B)

highly fissured

C)

likely to get seepage of water

D)

All of the above

Correct Answer : All of the above

18 .

The line at which the tunnel wall breaks from sloping outward can be given as _________

A)

Oval line

B)

Centre line

C)

Spring line

D)

Middle line

Correct Answer : Spring line

Explanation : Spring line is determined as the line at which the wall breaks from sloping outward to sloping inward toward the crown. This acts as a barrier between the outward and inward regions.

19 .

Which of the following should be considered while aligning a tunnel?

A)

Hydrological conditions

B)

Surface limits

C)

Climatic conditions

D)

Atmospheric conditions

Correct Answer : Hydrological conditions

Explanation : The determination of the alignment for tunnel can be done based on geological and hydrological conditions, cross-section and length of the continuous tunnel, time of consideration and limit of the surface.

20 .

An overhead track on a large truss frame is required in case of car changer by

A)

Dixon conveyor method

B)

the grass hopper method

C)

the passing track method

D)

California crossing method

Correct Answer : the grass hopper method

21 .

Pick up the correct statement from the following :

A)

The accuracy of 1 in 10, 000 is required for planimetric control

B)

The topographical maps of the Survey of India are useful in the mountainous region for tunnelling.

C)

1 second theodolite is used for angular measurement to achieve an angular error of 15 √N where N is number of angles

D)

All of the above

Correct Answer : All of the above

Explaination : * The height point on the ridge is fixed with the help of reciprocal ranging
* The accuracy of 1 in 10, 000 is required for planimetric control
* The topographical maps of the Survey of India are useful in the mountainous region for tunnelling.
* 1 second theodolite is used for angular measurement to achieve an angular error of 15 √N where N is number of angles

22 .

The length of the needle beam used in needle beam method of tunnelling is usually

A)

5 m to 6 m

B)

4 m to 7 m

C)

2.5 m to 6 m

D)

2 m to 4 m

Correct Answer : 5 m to 6 m

23 .

In case of drift method of tunnelling, the drift may be excavated at

A)

the top

B)

the bottom

C)

the centre

D)

All of the above

Correct Answer : All of the above

Explanation : * the top
* the bottom
* the centre
* the side

24 .

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

Correct Answer : 6.7 m to 7.3 m

25 .

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

A)

timber line

B)

cast iron lining

C)

Brick lining

D)

stone lining

Correct Answer : cast iron lining

26 .

In case of railways,

A)

tunnelling is preferred

B)

a open cut is preferred

C)

a detour round the hill is preferred

D)

All of the above

Correct Answer : tunnelling is preferred

27 .

The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than

A)

450 particles/cmÂ³

B)

400 particles/cmÂ³

C)

300 particles/cmÂ³

D)

250 particles/cmÂ³

Correct Answer : 450 particles/cmÂ³

28 .

Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.

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)

Firing of head holes is done just before the bench holes are fired

D)

After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench

Correct Answer : Firing of head holes is done just before the bench holes are fired

29 .

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

A)

dewatering

B)

foredrainage

C)

permanent drainage

D)

All of the above

Correct Answer : All of the above

30 .

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 :

A)

1 2 3 4

B)

3 2 4 1

C)

2 4 3 1

D)

4 3 1 2

Correct Answer : 3 2 4 1

31 .

For full face method, the excavation to be done is generally divided into

A)

two sections

B)

three sections

C)

four sections

D)

five sections

Correct Answer : three sections

32 .

The tunnels, the artificial underground passages are constructed for :

A)

highways

B)

railways

C)

sewerage

D)

All of the above

Correct Answer : All of the above

Explanation : * highways
* railways
* sewerage
* water supply project

33 .

Pick up the explosive used for tunnelling in soft rocks from the following :

A)

ammonia dynamite

B)

special gelatine

C)

semi-gelatine

D)

blasting gelatine

Correct Answer : ammonia dynamite

34 .

For B.G. single track, the section of the tunnel must have a width

A)

4.2 m to 4.5 m

B)

4.5 m to 4.8 m

C)

4.9 m to 5.5 m

D)

5.5 m to 5.8 m

Correct Answer : 4.9 m to 5.5 m

35 .

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 1 4 5

C)

2 3 5 4 1

D)

4 2 1 3 5

Correct Answer : 2 3 1 4 5

36 .

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

A)

avoidance of head on collisions

B)

facility in carrying out repairs

C)

economy in cost of construction

D)

All of the above

Correct Answer : All of the above

Explanation : * avoidance of head on collisions
* facility in carrying out repairs
* economy in cost of construction
* provision of separate exit and entrance of two traffic streams

37 .

For hauling muck from the tunnel, the following type of muck-car is used :

A)

muck box

B)

balle-ship

C)

U-bottom

D)

All of the above

Correct Answer : All of the above

Explanation : * muck box
* balle-ship
* U-bottom
* side dump car

38 .

Which one of the following methods is adopted for permanent drainage of tunnels :

A)

continuous open drains

B)

concrete lining

C)

provision of longitudinal drains

D)

All of the above

Correct Answer : All of the above

Explanation : * continuous open drains
* concrete lining
* provision of longitudinal drains
* grouting with cement or chemicals

39 .

Which of the following are percussion drills?

1. Shot drill
2. Diamond drill
3. Wagon drill
4. Churn drill

A)

1 and 2 are correct

B)

3 and 4 are correct

C)

1 and 4 are correct

D)

2 and 3 are correct

Correct Answer : 3 and 4 are correct

40 .

Which of the following methods of tunneling is used for long tunnels at great depths?

A)

Austrian method

B)

English method

C)

Army method

D)

Needle beam method

Correct Answer : Austrian method

41 .

Among the following, which doesnâ€™t belong to tunnel classification?

A)

Soft ground

B)

Rocky ground

C)

Firm ground

D)

Running ground

Correct Answer : Rocky ground

Explanation : Tunneling has been classified based on the type of strata present. It includes firm ground, soft ground and running ground. These will determine the bearing capacity of the soil.

42 .

Which method can be adopted if full face excavation is not possible?

A)

Plotting

B)

Trenching

C)

Benching

D)

Back bearing method

Correct Answer : Benching

Explanation : In case of no possibility of full face excavation, top heading method is adopted for having a better output. Benching process is also adopted for digging small tunnels

43 .

Among the following, which can be adopted for providing support for soft strata?

A)

Bents of steel

B)

Bents of iridium

C)

Bents of plastic

D)

Bents of aluminum

Correct Answer : Bents of steel

Explanation : The provision of soft strata must be done for withstanding the excavation. It can be provided by bents of wood, bents of steel, liner plates and poling, which are placed to retain material between the adjacent bents.

44 .

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

A)

remains free from snow

B)

reduces the maintenance cost

C)

avoids interference with surface rights

D)

All of the above

Correct Answer : All of the above

Explanation : * remains free from snow
* reduces the maintenance cost
* avoids interference with surface rights
* reduces the cost by reducing the route distance

45 .

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)

1 4 2 3

B)

2 3 1 4

C)

3 2 4 1

D)

4 1 3 2

Correct Answer : 1 4 2 3

46 .

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 4 6 1 5 2

B)

3 2 6 5 1 4

C)

4 1 2 3 6 5

D)

5 4 2 1 3 6

Correct Answer : 3 2 6 5 1 4

47 .

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

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)

All of the above

Correct Answer : All of the above

Explanation : * Oxygen should not be less than 19.5%
* Carbondioxide should not be more than 0.5%
* Hydrogen sulphide should not be more than 0.001%
* Carbon mono-oxide should not be more than 0.01%

48 .

A steel cylinder which is pushed in the soft soil is determined as ________

A)

Rod

B)

Shield

C)

Pole

D)

Jar born

Correct Answer : Shield

Explanation : In the case of soft grounds, tunneling can be dangerous and cave-ins are common. To prevent this, an iron or steel cylindrical element called shield is placed in the soft soil, which can crave the hole perfectly.

49 .

Which method can be adopted in case of rock tunneling?

A)

Tracing

B)

Benching

C)

Full face method

D)

Back bearing method

Correct Answer : Full face method

Explanation : Rock tunneling involves the same principle as of the tunneling in the ground. Those include full face method, top heading method and drift method. Based on the conditions of the area, these can be adopted.

50 .

To attain the required shape of the tunnel section, we use :

A)

trimmers

B)

easers

C)

chisels

D)

cut holes

Correct Answer : trimmers

51 .

In the given figure drill holes, heading, mucking and benching are numbered as 1, 2, 3, 4; The correct sequence is :

A)

4, 1, 3, 2

B)

1, 2, 3, 4

C)

3, 4, 1, 3

D)

4, 1, 2, 3

Correct Answer : 4, 1, 3, 2

52 .

If 'D' is the diameter of tunnel in meters, then the thickness of lining in mm, as per the empirical formula is given by

A)

42 D

B)

82 D

C)

104 D

D)

124 D

Correct Answer : 82 D

53 .

In "full face" method of constructing tunnels, the first operation relates to

A)

Removal of top portion

B)

Removal of bottom portion

C)

Excavation of one drift in the centre

D)

Excavation being done along the periphery

Correct Answer : Excavation being done along the periphery

54 .

Which of the following involves in the sequence of rocky strata?

A)

Placing rocks

B)

Recording values

C)

Marking profile

D)

Improving foul gases

Correct Answer : Marking profile

Explanation : Rocky strata involve usage of blasting method for developing tunnels. The sequence contains marking profile, loading explosive, removing foul gases, checking, scaling, mucking and bolting.

55 .

Which of the following can act as an alternative for blasting?

A)

Fire-setting

B)

Tunneling

C)

Continuous blasting

D)

Sequential blasting

Correct Answer : Fire-setting

Explanation : Blasting is the conventional method which is adopted in case of rock tunneling. In the case of fire-setting, tunnel is heated with fire and then cooled with water. Rapid expansion and contraction weakens and rock and tends to break.

56 .

If 'N' is the number of shafts used, then the total number of faces available for attacking the excavation and construction in tunnels are

A)

2N

B)

N + 2

C)

2N + 1

D)

2N + 2

Correct Answer : 2N + 2