GATE 2022 Civil Engineering Q47

Question

Water is flowing in a horizontal, frictionless, rectangular channel. A smooth hump is built on the channel floor at a section and its height is gradually increased to reach choked condition in the channel. The depth of water at this section is y₂ and that at its upstream section is y₁. The correct statement(s) for the choked and unchoked conditions in the channel is/are

Answer

In choked condition, y₁ decreases if the flow is supercritical and increases if the flow is subcritical.

Answer

In choked condition, y₂ is equal to the critical depth if the flow is supercritical or subcritical.

Answer

In unchoked condition, y₁ remains unaffected when the flow is supercritical or subcritical.

Answer

In choked condition, y₁ increases if the flow is supercritical and decreases if the flow is subcritical.