Question 1

The difference of heights of the tunnels above rail tops of BG and MG tracks is kept

Accepted Answer

0.60 m

Question 2

Which one of the following methods is generally adopted for tunnelling in firm ground

Accepted Answer

All the above.

Question 3

Which one of the following statements is not correct with regard to heading and hench-ing method of tunnelling.

Accepted Answer

Firing of head holes is done just before the bench holes are fired.

Tunnelling Questions