Question

In which case is the hydraulic jump not possible?

(a) Initial speed > critical speed

(b) Initial speed < critical speed

(c) Initial speed = critical speed

(d) Independent

I had been asked this question in an internship interview.

This interesting question is from Hydraulic Jump topic in division Non Uniform Flow in Channels of Fluid Mechanics

Answer 1

Right choice is (b) Initial speed < critical speed

Easiest explanation: 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. With the increase in the initial flow, the transition becomes abrupt.