Tunnelling - Section 1 (3)

Directions to Solve

Tunnelling - Section 1

The questions related to tunneling is available in the form of MCQs and in this
section you will find all the important questions.

17.

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.	l 3 2 4
D.	2 1 4 3

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

18.

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

A.	the grass hopper method
B.	passing track method
C.	the cherry picker
D.	California crossing, Dixon conveyor
E.	All the above.

Answer: Option E

Explanation:

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19.

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.	After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench.
D.	The holes in head and bench are loaded together with explosive for blasting.
E.	Firing of head holes is done just before the bench holes are fired.

Answer: Option E

Explanation:

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20.

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.	200 particles/cm3
B.	250 particles/cm3
C.	300 particles/cm3
D.	450 particles/cm3
E.	400 particles/cm3

Answer: Option D

Explanation:

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21.

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

A.	rock terrain
B.	soft rock
C.	running soil
D.	none of these.

Answer: Option A

Explanation:

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22.

Forepoling method is generally adopted for tunnelling in :

A.	soft ground
B.	firm ground
C.	running ground
D.	None of these.

Answer: Option A

Explanation:

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23.

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

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.

Answer: Option E

Explanation:

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24.

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.

Answer: Option E

Explanation:

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