Question is ⇒ In compressed air tunneling, the volume of free air provided is, Options are ⇒ (A) 6 mJ per second per m2 of face area, (B) 6 m3 per minute per m2 of face area, (C) 20 m3 per minute per m2 of face area, (D) 6 m3 per hour per m2 of face area, (E) , Leave your comments or Download question paper.

Question is ⇒ In compressed air tunneling, the volume of free air provided is, Options are ⇒ (A) 6 mJ per second per m2 of face area, (B) 6 m3 per minute per m2 of face area, (C) 20 m3 per minute per m2 of face area, (D) 6 m3 per hour per m2 of face area, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	In compressed air tunneling, the volume of free air provided is
A.	6 mJ per second per m2 of face area [Wrong Answer]
B.	6 m3 per minute per m2 of face area [Correct Answer]
C.	20 m3 per minute per m2 of face area [Wrong Answer]
D.	6 m3 per hour per m2 of face area [Wrong Answer]
View Answer 19 -2 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ Which one of the following tunneling methods is used for laying under ground sewers ?
Needle beam method
Army method
German method
Italian method

⇒ Which one of the following is a component of a shield for tunneling ?
liner plate
trench jack
stiffener
cutting edge

⇒ Which of the following lining material is useful for shield driven tunnels in sub aqueous regions ?
stone masonry
timber
cast iron
cement concrete

⇒ If 'N' is the number of shafts used, then the total number of feces available for attacking the excavation and construction in tunnels are
2N
N + 2
2 N + 1
2 N + 2

⇒ Which of the following is not a component of the shield ?
propelling jacks
liner plate
hood
tail

⇒ Drift method of tunnelling is used to construct tunnels in
soft grounds
rock
self supporting grounds
broken grounds

⇒ Circular section of tunnels is not suitable for
carrying water
non-cohesive soils
tunnels driven by shield method
placement of concrete lining

⇒ Drifters can be used to drill
only up holes
only down holes
horizontal or up holes
horizontal, down or up holes

⇒ Which one of the following is considered to be an advantage of the heading and benching method of tunnel construction?
It is suitable for construction in unstable rocks.
In this method, it is easy to install timber support.
Tunnelling can be continuous and the work can be expedited.
In case of excessive water, it is easy to take correct steps.

⇒ In Belgium method of tunnelling
construction of side walls is completed before invert and roof arch are built.
construction of roof arch is completed before side walls and invert are built.
construction of invert is completed before side walls and roof arch are built.
construction of invert and side walls is completed before roof arch is built.

⇒ As compared to a single free face, if a charge of explosive is placed equidistant from two faces, then the yield
remains same
decreases
increases by 2.25 times
increases by 3.5 times

⇒ The most suitable soil for compressed air tunneling is
silt
sand
clay
gravel

⇒ In "full face" method of constructing tunnels, the first operation relates to
removal of bottom portion
excavation of one drift in the center
removal of top portion
excavation being done along the periphery

⇒ The correct sequence of drilling equipment for increasing size of holes in tunnels is
wagon drill, churn drill, shot drill
wagon drill, shot drill, churn drill
shot drill, churn drill, wagon drill
churn drill, wagon drill, shot drill

⇒ Ribs are used for strengthening and stiffening the liner plate for tunnels of diameter greater than
2 m
3 m
4 m
5 m

⇒ 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

⇒ Which of the following methods of tunneling is used for long tunnels at great depths ?
Army method
Needle beam method
Austrian method
English method

⇒ If 'D' is the diameter of tunnel in metres, then the thickness of lining in mm, as per the empirical formula is given by
42 D
82 D
104 D
124 D

⇒ In compressed air tunneling, the volume of free air provided is
6 mJ per second per m2 of face area
6 m3 per minute per m2 of face area
20 m3 per minute per m2 of face area
6 m3 per hour per m2 of face area