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Tunnelling MCQ

Which one of the following statements is not correct in respect of setting of an inclined tunnel:

Reference points are constructed at every 300 m.

Reference points are constructed on the roof of tunnels

The level of the invert at the heading is marked by a tape.

None the above.

The alignment is fixed from upper/lower apex point.

Answer

Correct Answer: None the above.

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

Full face method

All these

Top heading and benching method

Drift method

Answer

Correct Answer: Full face method

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

All of these

Holes are drilled by pneumatically operated rock drills

The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge

One drill is required for each 4 to 5 m2 force area

Answer

Correct Answer: All of these

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

No opening is provided.

Two openings are provided

Three openings are provided

One opening is provided

Answer

Correct Answer: Two openings are provided

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

250 particles/cm3

450 particles/cm3

200 particles/cm3

400 particles/cm3

300 particles/cm3

Answer

Correct Answer: 450 particles/cm3

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

6.7 m to 7.3 m

5.8 m to 6.2 m

5.5 m to 5.8 m

7.3 m to 7.5 m

Answer

Correct Answer: 6.7 m to 7.3 m

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

4.2 m to 4.5 m

4.9 m to 5.5 m

4.5 m to 4.8 m

5.5 m to 5.8 m

Answer

Correct Answer: 4.9 m to 5.5 m

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

Easers

Trimmers

Chisels.

Cut holes

Answer

Correct Answer: Trimmers

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

Two sections

Five sections.

Four sections

Three sections

Answer

Correct Answer: Three sections

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

The holes in head and bench are loaded together with explosive for blasting.

Driving of tunnel is done in two portions of its section

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

Driving the top portion is done in advance of the bottom portion.

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

Answer

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

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Railway tunnels, are generally

Circular

None of these.

Polycentric

Rectangular

Parabolic

Answer

Correct Answer: Polycentric

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

Shield method

Compressed air method

Mechanical tunneler i.e. mole method

All the these.

Linear plate method

Answer

Correct Answer: All the these.

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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:

1 2 3 4 5

2 3 1 4 5

2 3 5 4 1

4 2 1 3 5

Answer

Correct Answer:

2 3 1 4 5

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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:

5 4 2 1 3 6

3 4 6 1 5 2

4 1 2 3 6 5

3 2 6 5 1 4

Answer

Correct Answer:

3 2 6 5 1 4

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In case of railways,

Tunnelling is preferred

All these

A detour round the hill is preferred

A open cut is preferred

Answer

Correct Answer: Tunnelling is preferred

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

Timber line

Concrete lining.

Stone lining

Brick lining

Cast iron lining

Answer

Correct Answer: Cast iron lining

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

Hydrogen sulphide should not be more than 0.001%

Carbon mono-oxide should not be more than 0.01%

Oxygen should not be less than 19.5%

Carbondioxide should not be more than 0.5%

All of these

Answer

Correct Answer: All of these

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

All these

Blowing fresh air and exhausting foul air by ducts

Blowing fresh air by ducts to the face of tunnel

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

Answer

Correct Answer: Blowing fresh air by ducts to the face of tunnel

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The tunnels, the artificial underground passages are constructed for:

Sewerage

Water supply project

All these

Highways

Railways

Answer

Correct Answer: All these

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

2.5 m to 6 m

5 m to 6 m

4 m to 7 m

2 m to 4 m

Answer

Correct Answer: 5 m to 6 m

Note: This Question is unanswered, help us to find answer for this one

Tunnelling MCQ

Which one of the following statements is not correct in respect of setting of an inclined tunnel:

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

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

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

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

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

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

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

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

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

Railway tunnels, are generally

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

The following operations are required for tunnelling in rocky terrain:1. Removing the foul gases2. Marking the tunnel profile3. Setting up and drilling4. Checking misfire5. Mucking The correct sequence is:

The following operations are generally employed for tunnelling in hard rock.1. Removing ground water,2. Loading holes and firing the explosive3. Setting up and drilling4. Grouting and lining5. Removing muck6. Ventilation and removing explosion dustThe correct sequence is:

In case of railways,

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

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

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

The tunnels, the artificial underground passages are constructed for:

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

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:

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: