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MCQs

Total Questions : 203 | Page 9 of 21 pages
Question 81. 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
Answer: (a).rock terrain
Question 82. Which one of the following statements is not correct with regard to heading and hench-ing 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 head holes is done just before the bench holes are fired.
 Discuss Question
Answer: Option D. -> Firing of head holes is done just before the bench holes are fired.
Answer: (d).Firing of head holes is done just before the bench holes are fired.
Question 83. The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than
  1.    200 particles/cm³
  2.    250 particles/cm³
  3.    300 particles/cm³
  4.    450 particles/cm³
 Discuss Question
Answer: Option D. -> 450 particles/cm³
Answer: (d).450 particles/cm³
Question 84. 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.
Answer: (d).All the above.
Question 85. Which one of the following linings is suitable for shield driven tunnels particularly in the subaqueous regions :
  1.    Brick lining
  2.    stone lining
  3.    timber line
  4.    cast iron lining
 Discuss Question
Answer: Option D. -> cast iron lining
Answer: (d).cast iron lining
Question 86.

An overhead track on a large truss frame is required in case of car changer by


  1.    the grass hopper method
  2.    the passing track method
  3.    California crossing method
  4.    Dixon conveyor method.
 Discuss Question
Answer: Option A. -> the grass hopper method


Question 87.

For B.G. single track, the section of the tunnel must have a width



  1.    4.2 m to 4.5 m
  2.    4.5 m to 4.8 m
  3.    4.9 m to 5.5 m
  4.    5.5 m to 5.8 m
 Discuss Question
Answer: Option C. -> 4.9 m to 5.5 m


Question 88.


Pick up the explosive used for tunnelling in soft rocks from the following :



  1.    blasting gelatine
  2.    special gelatine
  3.    ammonia dynamite
  4.    semi-gelatine
 Discuss Question
Answer: Option C. -> ammonia dynamite


Question 89.


Railway tunnels, are generally



  1.    polycentric
  2.    rectangular
  3.    parabolic
  4.    circular
  5.    none of these.
 Discuss Question
Answer: Option A. -> polycentric


Question 90.

Which one of the following methods is generally adopted for tunnelling in firm ground



  1.    Full face method
  2.    Top heading and benching method
  3.    Drift method
  4.    All the above.
 Discuss Question
Answer: Option D. -> All the above.


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