Question

Which type of trap is shown by the figure below?

(a) S- trap

(b) P- trap

(c) Q-trap

(d) R-trap

The question was asked in an interview for internship.

My question is from Water Supply Works topic in chapter Road Estimating, Sanitary and Water Supply Work of Civil Engineering Drawing

Answer 1

Right choice is (a) S- trap

The best I can explain: In domestic applications, traps are typically U, S, Q or J-shaped pipe located below or within a plumbing fixture. An S-shaped trap is also known as an S-bend. It was invented by Alexander Cummings in 1775 but became known as the U-bend following the introduction of the U-shaped trap by Thomas Crapper in 1880. The new U-bend could not jam, so, unlike the S-bend, it did not need an overflow. The most common of these traps in houses is referred to as a P-trap. It is the addition of a 90 degree fitting on the outlet side of a U-bend, thereby creating a P-like shape.