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Tunnelling

Q1: 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.

ANS:D - All of the above.

No answer description is available. 



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