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Tunnelling - Engineering

Q1:

Which one of the following statements is not correct in respect of setting of an inclined tunnel:

A Reference points are constructed at every 300 m.

B The alignment is fixed from upper/lower apex point.

C The level of the invert at the heading is marked by a tape.

D Reference points are constructed on the roof of tunnels

E None the above.

ANS:E - None the above.

Reference points are constructed at every 500 m.

So, option A is incorrect.