Allied & ICAR Exam Bank • ALLIED_0393 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Open Channel Flow

Subtopic: Open Channel Flow

Question Statement:

The Manning's equation is dimensionally non-homogeneous because the roughness coefficient $n$ has dimensions of:

Options:

  • (A) $[L^{-1/3} T]$
  • (B) $[L^{1/3} T^{-1}]$
  • (C) Dimensionless
  • (D) $[L T^{-1}]$

Answer Key:

A

Step-by-Step Solution & Explanation

From $v = \frac{1}{n} R^{2/3} S^{1/2}$, with $v [L T^{-1}]$ and $R^{2/3} [L^{2/3}]$, $n = [L^{2/3}] / [L T^{-1}] = [L^{-1/3} T]$.
← Previous (ALLIED_0392) Next (ALLIED_0394) →

Practice In Authentic CBT Exam Interface

Test your skills under authentic timed conditions with live scoring and AIR percentile ranking.

Launch CBT Mock Test