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

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

Correct Answer

all the above.

Tunnelling problems

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1. 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 :
Options
A. 3 2 4 1
B. 1 2 3 4
C. 4 3 1 2
D. 2 4 3 1

2. 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 :
Options
A. 1 2 3 4
B. 4 3 2 1
C. l 3 2 4
D. 2 1 4 3

4. An overhead track on a large truss frame is required in case of car changer by
Options
A. the grass hopper method
B. the passing track method
C. California crossing method
D. Dixon conveyor method.

6. In the wooded bulk-head, used for mucking in steep grade tunnels,
Options
A. one opening is provided
B. two openings are provided
C. three openings are provided
D. no opening is provided.

8. Pick up the correct statement from the following during tunnel excavation,
Options
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. Carbon mono-oxide should not be more than 0.01%
E. All of the above.

9. 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:
Options
A. 4 1 3 2
B. 1 4 2 3
C. 2 3 1 4
D. 3 2 4 1

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