Pick up the correct statement regarding drilling a tunnel from the fol

1.	Pick up the correct statement regarding drilling a tunnel from the following:
A.	Holes are drilled by pneumatically operated rock drills
B.	One drill is required for each 4 to 5 m2 force area
C.	The diameter of the bore hole at the deepest point should be 6 mm more than the diameter of the cartridge
D.	All of the above.
Answer» E.

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The following tunnels were constructed in different countries for different purposes : 1. Emperor Claudius built the first Roman tunnel2. The first highway tunnel was constructed in Hungary3. The first underground railway tunnel was constructed in Great Britain4. The first navigational tunnel was constructed in France.The correct chronological development of these tunnels is:
For initial surveys of tunnels, the following activities are involved:1. Marking portal point with concrete pillars on the ground2. Marking tunnel obligatory points on the topographical maps3. Preliminary setting of the tunnel on the topographical Survey of India maps3. Driving lines between the fixed obligatory points.The correct sequence of the activities is :
For transferring the tunnel alignment through shafts, we adopt the following steps :1. Hanging two or more plumb lines in the shaft2. Determining the bearing of the plumb lines i.e. plumb plane3. Suspending a 35 kg weight by each plumb line4. Immersing the weights of both the plumb lines in the buckets containing water.The correct sequence of steps is :
The following operations are required for tunnelling in rocky terrain :1. Removing the foul gases2. Marking the tunnel profile3. Setting up and drilling4. Checking misfire5. MuckingThe correct sequence is :
The following operations are generally employed for tunnelling in hard rock. 1. Removing ground water, 2. Loading holes and firing the explosive3. Setting up and drilling4. Grouting and lining5. Removing muck6. Ventilation and removing explosion dustThe correct sequence is :
Which of the following involves in the sequence of rocky strata?
Which of the following can act as an alternative for blasting?
Which method can be adopted in case of rock tunneling?
A steel cylinder which is pushed in the soft soil is determined as ________
Among the following, which can be adopted for providing support for soft strata?

Pick up the correct statement regarding drilling a tunnel from the following:

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