Q.1

In case of drift method of tunnelling, the drift may be excavated at

  • the centre
  • the bottom
  • the top
  • the side
  • All of the above.
Q.2

A tunnel is found more advantageous as compared to the alternate routes because it:

  • remains free from snow
  • reduces the cost by reducing the route distance
  • reduces the maintenance cost
  • avoids interference with surface rights
  • All the above.
Q.3

For B.G. single track railway, the height of the tunnel above top of rails should be

  • 5.5 m to 5.8 m
  • 5.8 m to 6.2 m
  • 6.7 m to 7.3 m
  • 7.3 m to 7.5 m
0 h : 0 m : 1 s