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MCQs

Total Questions : 203 | Page 18 of 21 pages
Question 171. . 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 172. . Which one of the following methods of tunnelling doe not require the use of time bearing :
  1.    Linear plate method
  2.    Shield method
  3.    Compressed air method
  4.    All the these.
 Discuss Question
Answer: Option D. -> All the these.
Question 173. . In case of drift method of tunnelling, the drift may be excavated at
  1.    the centre
  2.    the bottom
  3.    the top
  4.    All of the above.
 Discuss Question
Answer: Option D. -> All of the above.
Question 174. . Railway tunnels, are generally
  1.    polycentric
  2.    rectangular
  3.    parabolic
  4.    circular
 Discuss Question
Answer: Option A. -> polycentric
Question 175. . 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
Question 176. .  Which one of the following statements is not correct with regard to heading and henching method of tunnelling.
  1.    Driving of tunnel is done in two portions of its section
  2.    Driving the top portion is done in advance of the bottom portion.
  3.    After driving the top portion 3 m to 3.5 m holes are drilled into the head and bench.
  4.    Firing of headholes is done just before the bench holes are fired:
 Discuss Question
Answer: Option D. -> Firing of headholes is done just before the bench holes are fired:
Question 177. .  The length of the needle beam used in needle beam method of tunnelling is usually
  1.    2 m to 4 m
  2.    2.5 m to 6 m
  3.    4 m to 7 m
  4.    5 m to 6 m.
 Discuss Question
Answer: Option D. -> 5 m to 6 m.
Question 178. . WhiCh one of the following statements is not correct for heading and benching method of tunnelling ?
  1.    Drilling and mucking can be done simultaneously
  2.    Benching provides a plateform for working on heading
  3.    Removal of muck from the heading is very easy
  4.    None of these.
 Discuss Question
Answer: Option C. -> Removal of muck from the heading is very easy
Question 179. . 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 180. .  The most commonly adopted pattern of cut holes is :
  1.    horizontal wedge cut
  2.    pyramid cut
  3.    fan cut
  4.    All the above.
 Discuss Question
Answer: Option D. -> All the above.

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