Question

Underground conduits can be classified into ___________ types.

(a) 2

(b) 4

(c) 3

(d) 5

I had been asked this question in a national level competition.

This intriguing question originated from Classes of Underground Conduits in division Shafts, Tunnels and Conduits of Geotechnical Engineering II

Answer 1

Right option is (c) 3

Best explanation: Based on the type of installations, conduits can be classified into 3 types:

i) Ditch conduits

ii) Projecting conduits

iii) Special conduits.