Method of placing tubes in public utility tunnels is called ______

Layers dipping at angles up to 45° may be called ______

Tunnels associated with hydropower generation are called ______

Traffic tunnels are always constructed for kilometres.

Subway and tube railways are studied under which type of tunnels?

Pick the tunnel which is not a sub-group of traffic tunnels.

Type of hydropower tunnel where water is conveyed under gravity is ______

Lithology does not affect which parameter?