Question

The limiting head of water value in pneumatic caisson is ________

(a) 40 m

(b) 25 m

(c) 35 m

(d) 50 m

This question was addressed to me at a job interview.

The question is from Well Foundations topic in section Well Foundations of Geotechnical Engineering II

Answer 1

Correct choice is (c) 35 m

Easiest explanation: As the maximum air pressure is limited to 3.5 kg /cm2. the limiting head of water is given by:

hlim = 3.5/0.1 = 35 m.