For transferring the tunnel alignment through shafts, we adopt the following steps:
A. 1, 2, 3, 4
B. 4, 3, 2, 1
C. 1, 3, 2, 4
D. 2, 1, 4, 3
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Which one of the following is considered to be an advantage of the heading and benching method of tunnel construction?
A. It is suitable for construction in unstable rocks
B. In this method, it is easy to install timber support
C. Tunneling can be continuous and the work can be expedited
D. In case of excessive water, it is easy to take correct steps
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Which one of the following methods is generally adopted for tunnelling in firm ground
A. Full face method
B. Top heading and benching method
C. Drift method
D. All the above
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Which of the following is not a component of the shield?
A. Propelling jacks
B. Liner plate
C. Hood
D. Tail
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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. Benching provides a platform for working on heading
C. Removal of muck from the heading is very easy
D. None of these
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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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What is the correct sequence of the following events in rock tunnelling?
A. 1, 6, 5, 3, 4, 2, 7
B. 1, 2, 6, 3, 5, 4, 7
C. 1, 6, 2, 5, 4, 3, 7
D. 1, 6, 2, 5, 3, 4, 7
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An overhead track on a large truss frame is required in case of car changer by
A. The grass hopper method
B. The passing track method
C. California crossing method
D. Dixon conveyor method
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Pick up the explosive used for tunnelling in soft rocks from the following:
A. Blasting gelatine
B. Special gelatine
C. Ammonia dynamite
D. Semi-gelatine
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Pick up the mechanical ventilation method used for tunnels from the following:
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
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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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Pick up the correct statement from the following:
A. The topographical maps of the Survey of India are useful in the mountainous region for tunnelling
B. The height point on the ridge is fixed with the help of reciprocal ranging
C. The accuracy of 1 in 10,000 is required for planimetric control
D. All the above
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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
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For highways, tunnelling is preferred to if the open cut exceeds:
A. 10 meters depth
B. 15 meters depth
C. 20 meters depth
D. 25 meters depth
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Forepoling method is generally adopted for tunnelling in:
A. Soft ground
B. Firm ground
C. Running ground
D. None of these
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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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The needle beam method of tunnelling
A. Only (i) is correct
B. (i), (ii) and (iv) are correct
C. (i), (iii) and (iv) are correct
D. (i) and (ii) are correct
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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
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In “full face” method of constructing tunnels, the first operation relates to
A. Removal of bottom portion
B. Excavation of one drift in the centre
C. Removal of top portion
D. Excavation being done along the periphery
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The following operations are generally employed for tunnelling in hard rock.
A. 3, 2, 6, 5, 1, 4
B. 3, 4, 6, 1, 5, 2
C. 4, 1, 2, 3, 6, 5
D. 5, 4, 2, 1, 3, 6
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