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Tunnelling - Engineering

Q1:

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

ANS:D - 5 m to 6 m

It is the standard length of the needle beam.
i.e) 5-6 m.