Question Bank • QB_SWCE_EXP_009 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Fluid Mechanics

Subtopic: Flow in open channels

Question Statement:

In an open channel flow, when the Froude number $Fr > 1$, the flow is classified as:

Options:

  • (A) Subcritical (Tranquil)
  • (B) Critical
  • (C) Supercritical (Shooting/Torrential)
  • (D) Laminar

Answer Key:

C

Step-by-Step Solution & Explanation

Froude number $Fr = \frac{V}{\sqrt{g D}}$ determines flow regime: • $Fr < 1$: Subcritical or tranquil flow. • $Fr = 1$: Critical flow. • $Fr > 1$: Supercritical, rapid, or shooting flow.
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