Related Questions

In compressed air tunnelling, the volume of free air provided is
A 6 m3 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
Which one of the following methods of tunnelling does not require the use of time bearing?
A Linear plate method
B Shield method
C Compressed air method
D All of these
The length of the needle beam used in needle beam method of tunnelling is usually
A 2 m to 4 m
B 2.5 m to 6 m
C 4 m to 7 m
D 5 m to 6 m
In Belgium method of tunnelling
A Construction of side walls is completed before invert and roof arch are built
B Construction of roof arch is completed before side walls and inverts are built
C Construction of invert is completed before side walls and roof arch are built
D Construction of invert and side walls is completed before roof arch is built
Which one of the following methods is generally adopted for tunnelling in firm ground
A Full face method
B Top heading and benching method
C Drift method
D All the above
Which one of the following statements is not correct for heading and benching method of tunnelling?
A Drilling and mucking can be done simultaneously
B Benching provides a platform for working on heading
C Removal of muck from the heading is very easy
D None of these
Which one of the following statements is not correct with regard to heading and henching method of tunnelling?
A Driving of tunnel is done in two portions of its section
B Driving the top portion is done in advance of the bottom portion
C The holes in head and bench are loaded together with explosive for blasting
D Firing of head holes is done just before the bench holes are fired
Pick up the explosive used for tunnelling in soft rocks from the following:
A Blasting gelatine
B Special gelatine
C Ammonia dynamite
D Semi-gelatine
For highways, tunnelling is preferred to if the open cut exceeds:
A 10 meters depth
B 15 meters depth
C 20 meters depth
D 25 meters depth
Forepoling method is generally adopted for tunnelling in:
A Soft ground
B Firm ground
C Running ground
D None of these

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