Question

The diameter of the perforated pipe used in well point system is __________

(a) 0.5 to 1 m

(b) 5 to 8 cm

(c) 2 to 4 cm

(d) 1 to 3.5 m

I had been asked this question in an interview.

This intriguing question originated from Well Point System topic in section Drainage and Dewatering of Geotechnical Engineering I

Answer 1

The correct answer is (b) 5 to 8 cm

Best explanation: A well point is a perforated pipe about 0.5 to 1 m long and 5 to 8 cm in diameter covered by cylindrical wire-gauge screen.