Q.1
A good blast with a good yield is obtained if the cut hole is
  • Normal to face
  • Inclined at 45° to the face
  • Inclined at 15° to the face
  • Inclined at 30° to the face
Q.2
The length of the needle beam used in needle beam method of tunnelling is usually
  • 2 m to 4 m
  • 2.5 m to 6 m
  • 4 m to 7 m
  • 5 m to 6 m
Q.3
Which one of the following methods of tunnelling does not require the use of time bearing?
  • Linear plate method
  • Shield method
  • Compressed air method
  • All of these
Q.4
Circular section of tunnels is not suitable for
  • Carrying water
  • Non-cohesive soils
  • Tunnels driven by shield method
  • Placement of concrete lining
Q.5
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
  • The alignment is fixed from upper/lower apex point
  • The level of the invert at the heading is marked by a tape
  • None the above
Q.6
Drifters can be used to drill
  • Only up holes
  • Only down holes
  • Horizontal or up holes
  • Horizontal down or up holes
Q.7
In case of drift method of tunnelling, the drift may be excavated at
  • The centre
  • The top or bottom
  • The side
  • All of the above
Q.8
Pick up the correct statement from the following during tunnel excavation,
  • Oxygen should not be less than 19.5%
  • Carbondioxide should not be more than 0.5%
  • Hydrogen sulphide should not be more than 0.001%
  • All of the above
Q.9
The following tunnels were constructed in different countries for different purposes: 1.Emperor Claudius built the first Roman tunnel2.The first highway tunnel was constructed in Hungary3.The first underground railway tunnel was constructed in Great Britain4.The first navigational tunnel was constructed in France.The correct chronological development of these tunnels is:
  • 4, 1, 3, 2
  • 1, 4, 2, 3
  • 2, 3, 1, 4
  • 3, 2, 4, 1
Q.10
Assertion A: English method of tunnelling requires more time as compared to other methods of tunnelling.Reason R: In English method of tunnelling, the masons and excavators have to work alternatelySelect your answer based on the coding system given below:
  • Both A and R is true and R is the correct explanation of A
  • Both A and R is true and R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
Q.11
As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yield
  • Remain same
  • Decreases
  • Increases by 2.25 times
  • Increases by 3.5 times
Q.12
Assertion A: When rock conditions are favorable, it will not be necessary to take up concrete lining concurrently with the driving operations till the full length of the tunnel has been driven through rock.Reason R: A tunnel through rock, hard or soft, does not need any concrete liningSelect your answer based on the coding system given below:
  • Both A and R is true and R is the correct explanation of A
  • Both A and R is true but R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
Q.13
If ‘D’ is the diameter of tunnel in meters, then the thickness of lining in mm, as per the empirical formula is given by
  • 42 D
  • 82 D
  • 104 D
  • 124 D
Q.14
American method of tunnelling (i) Is suitable for large sized tunnels (ii) Is not suitable for railway or highway tunnels (iii) Requires heavy timbers
  • Only (i) is correct
  • (i) and (iii) are correct
  • (ii) and (iii) are correct
  • (i) and (ii) are correct
Q.15
In the given figure drill holes, heading, mucking and benching are numbered asThe correct sequence is:
  • 4, 1, 2, 3
  • 1, 2, 3, 4
  • 4, 1, 3, 2
  • 3, 4, 1, 3
Q.16
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:
  • 3, 2, 6, 5, 1, 4
  • 3, 4, 6, 1, 5, 2
  • 4, 1, 2, 3, 6, 5
  • 5, 4, 2, 1, 3, 6
Q.17
In “full face” method of constructing tunnels, the first operation relates to
  • Removal of bottom portion
  • Excavation of one drift in the centre
  • Removal of top portion
  • Excavation being done along the periphery
Q.18
The needle beam method of tunnelling (i) Is suitable for soils in which roof can stand for few minutes without support (ii) Is suitable for brick lining (iii) Is suitable for concrete lining (iv) Requires large number of trench jacks
  • Only (i) is correct
  • (i), (ii) and (iv) are correct
  • (i), (iii) and (iv) are correct
  • (i) and (ii) are correct
Q.19
For highways, tunnelling is preferred to if the open cut exceeds:
  • 10 meters depth
  • 15 meters depth
  • 20 meters depth
  • 25 meters depth
Q.20
If ‘N’ is the number of shafts used, then the total number of faces available for attacking the excavation and construction in tunnels are
  • 2N
  • N + 2
  • 2N + 1
  • 2N + 2
Q.21
Pick up the explosive used for tunnelling in soft rocks from the following:
  • Blasting gelatine
  • Special gelatine
  • Ammonia dynamite
  • Semi-gelatine
Q.22
Pick up the mechanical ventilation method used for tunnels from the following:
  • 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
  • Blowing fresh air and exhausting foul air by ducts
  • All the above
Q.23
Pick up the correct statement regarding drilling a tunnel from the following:
  • Holes are drilled by pneumatically operated rock drills
  • One drill is required for each 4 to 5 m2 force area
  • The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
  • All of the above
Q.24
What is the correct sequence of the following events in rock tunnelling?1.Marking tunnel profile2.Loading explosives and blasting3.Checking misfire4.Mucking5.Removing foul gas6.Setting up and drilling7.GunitingSelect the correct answer using the codes given below.
  • 1, 6, 5, 3, 4, 2, 7
  • 1, 2, 6, 3, 5, 4, 7
  • 1, 6, 2, 5, 4, 3, 7
  • 1, 6, 2, 5, 3, 4, 7
Q.25
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 akg weight by each plumb line4.Immersing the weights of both the plumb lines in the buckets containing waterThe correct sequence of steps is:
  • 1, 2, 3, 4
  • 4, 3, 2, 1
  • 1, 3, 2, 4
  • 2, 1, 4, 3
0 h : 0 m : 1 s