Question

In a house drainage system, the pipe which is used to preserve the water seal of traps is called __________

(a) Waste pipe

(b) Rainwater pipe

(c) Vent pipe

(d) Anti-siphonage pipe

I had been asked this question during an interview for a job.

This intriguing question originated from Plumbing for Buildings topic in portion Plumbing for Buildings of Construction & Building Materials

Answer 1

Right answer is (d) Anti-siphonage pipe

The best I can explain: In a house drainage system, the pipe which is used to preserve the water seal of traps is called anti-siphonage pipe. The vent pipe is provided to serve the purpose of ventilation of the system. The waste pipe carries only liquid waste. Rainwater pipe carries only rainwater.