Question Bank • QB_EXP_SWCE_ENR_016 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Specific Energy, Critical Flow & Hydraulic Jump

Subtopic: Specific energy and critical flow

Question Statement:

On the specific energy curve shown, an upward step of height $\Delta z$ on the channel bed (with no change in channel width) causes the specific energy of flow to:

Options:

  • (A) Decrease by delta z
  • (B) Increase by delta z
  • (C) Remain unchanged
  • (D) Double

Answer Key:

A

Step-by-Step Solution & Explanation

By the energy equation, $E_2 = E_1 - \Delta z$. The specific energy available over the hump decreases by exactly the step height $\Delta z$.
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