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MCQs

Total Questions : 203 | Page 6 of 21 pages
Question 51. Pick up the correct statement regarding drilling a tunnel from the following:
  1.    Holes are drilled by pneumatically operated rock drills
  2.    One drill is required for each 4 to 5 m2 force area
  3.    The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 52. If ‘N’ is the number of shafts used, then the total number of faces available for attacking the excavation and construction in tunnels are
  1.    2N
  2.    N + 2
  3.    2N + 1
  4.    2N + 2
 Discuss Question
Answer: Option D. -> 2N + 2
Question 53. Pick up the correct statement from the following:
  1.    The topographical maps of the Survey of India are useful in the mountainous region for tunnelling
  2.    The height point on the ridge is fixed with the help of reciprocal ranging
  3.    The accuracy of 1 in 10,000 is required for planimetric control
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 54. Forepoling method is generally adopted for tunnelling in:
  1.    Soft ground
  2.    Firm ground
  3.    Running ground
  4.    None of these
 Discuss Question
Answer: Option A. -> Soft ground
Question 55. For highways, tunnelling is preferred to if the open cut exceeds:
  1.    10 meters depth
  2.    15 meters depth
  3.    20 meters depth
  4.    25 meters depth
 Discuss Question
Answer: Option B. -> 15 meters depth
Question 56. A tunnel is found more advantageous as compared to the alternate routes because it:
  1.    Remains free from snow
  2.    Reduces the cost by reducing the route distance
  3.    Reduces the maintenance cost
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 57. 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
  1.    Only (i) is correct
  2.    (i), (ii) and (iv) are correct
  3.    (i), (iii) and (iv) are correct
  4.    (i) and (ii) are correct
 Discuss Question
Answer: Option B. -> (i), (ii) and (iv) are correct
Question 58. In “full face” method of constructing tunnels, the first operation relates to
  1.    Removal of bottom portion
  2.    Excavation of one drift in the centre
  3.    Removal of top portion
  4.    Excavation being done along the periphery
 Discuss Question
Answer: Option D. -> Excavation being done along the periphery
Question 59. Concrete lining is provided concurrently with the driving operation in case of
  1.    Rock terrain
  2.    Soft rock
  3.    Running soil
  4.    None of these
 Discuss Question
Answer: Option A. -> Rock terrain
Question 60. 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:
  1.    3, 2, 6, 5, 1, 4
  2.    3, 4, 6, 1, 5, 2
  3.    4, 1, 2, 3, 6, 5
  4.    5, 4, 2, 1, 3, 6
 Discuss Question
Answer: Option A. -> 3, 2, 6, 5, 1, 4

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