Question

Anti-siphonage pipe is connected to _____________

(a) top of P trap W.C.

(b) main soil pipe

(c) bottom of P trap W.C.

(d) side of water closet

The question was asked in an interview for internship.

The origin of the question is Sanitary Works in division Road Estimating, Sanitary and Water Supply Work of Civil Engineering Drawing

Answer 1

Right choice is (c) bottom of P trap W.C.

To explain: A vent is open at top and bottom, to facilitate exit of foul gases. It is carried at least one meter higher than the roof level. Rain water pipe: it is a pipe which carries only the rain water. Anti-siphonage pipe: it is pipe which is installed in the house drainage to preserve the water seal of traps.