Question

A constant radius arch dam is also sometimes called as _______________

(a) constant centre arch dam

(b) constant angle arch dam

(c) variable angle arch dam

(d) variable centre arch dam

This question was addressed to me in an interview for job.

Question is from Arch Dams in chapter Arch and Buttress Dams of Irrigation Engineering

Answer 1

Correct option is (a) constant centre arch dam

Best explanation: In a constant radius arch dam, the centres of extrados, intrados as well as the centrelines of the horizontal arch rings lie on a straight vertical line at various elevations that passes through the centre of the horizontal arch ring at the crest. The centre of the arch rings is not at one point but lies along on vertical line at different heights where in variable centre arch dam the centres do not lie on the same vertical line.