Question

Fluid height before the hydraulic jump is ________

(a) Normal

(b) Low

(c) High

(d) Zero

This question was posed to me in an international level competition.

My query is from Hydraulic Jump topic in chapter Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

The correct answer is (b) Low

The best I can explain: Hydraulic jump is not possible when the initial speed is less than the critical speed. There is a transition that is created during the change. The transition appears as an undulating wave. Fluid height before the hydraulic jump is low.