- A. 1, 2, 3, 4
- B. 4, 3, 2, 1
- C. 1, 3, 2, 4
- D. 2, 1, 4, 3
Tunnel Engineering
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For transferring the tunnel alignment through shafts, we adopt the following steps:1.Hanging two or more plumb lines in the shaft2.Determining the bearing of the plumb lines i.e. plumb plane3.Suspending a 35 kg weight by each plumb line4.Immersing the weights of both the plumb lines in the buckets containing waterThe correct sequence of steps is:
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Which one of the following is a component of a shield for tunneling?
- A. Liner plate
- B. Trench jack
- C. Stiffener
- D. Cutting edge
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Which one of the following statements is not correct with regard to heading and henching 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. The holes in head and bench are loaded together with explosive for blasting
- D. Firing of head holes is done just before the bench holes are fired
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Which of the following are percussion drills?(i) Shot drill(ii) Diamond drill(iii) Wagon drill(iv) Churn drill
- A. (i) and (ii) are correct
- B. (iii) and (iv) are correct
- C. (i) and (iv) are correct
- D. (ii) and (iii) are correct
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For initial surveys of tunnels, the following activities are involved:1.Marking portal point with concrete pillars on the ground2.Marking tunnel obligatory points on the topographical maps3.Preliminary setting of the tunnel on the topographical Survey of India maps4.Driving lines between the fixed obligatory pointsThe correct sequence of the activities is:
- A. 3, 2, 4, 1
- B. 1, 2, 3, 4
- C. 4, 3, 1, 2
- D. 2, 4, 3, 1
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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. All the above
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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. None the above
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The method of draining in the tunnels, is generally known as_____.
- A. Foredrainage
- B. Dewatering
- C. Permanent drainage
- D. All of the above
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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 m2 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
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Consider the following situations.1.Soil is soft.2.Volume of existing surface traffic on the alignment is heavy.3.Track is at a deeper level.4.Water table is high.In the construction of Metro Railways, “Cut and Cover” method of construction is suitable in situations listed at “
- A. 1 and 2
- B. 1 and 3
- C. 1 and 4
- D. 2 and 3