Question

Depending upon the Froude number, into how many groups the jumps are classified?

(a) 8

(b) 6

(c) 7

(d) 4

The question was asked at a job interview.

This is a very interesting question from Hydraulic Jump topic in section Diversion Head Works, Hydraulic Jump Usefulness in Irrigation Structure of Irrigation Engineering

Answer 1

Correct answer is (b) 6

Explanation: According the values of Froude number (F1) the jumps are classified into six groups. Namely, no jump for F1 = 1, for F1 = 1 to 1.7 the jump is undular jump, for F1 = 1.7 to 2.5 the jump is weak jump, for F1  = 2.5 to 4.5 the jump is oscillating jump, for F1 = 4.5 to 9 the jump is steady jump, and for F1 = 9 or above the jump is strong jump.