# Fluid Mechanics Questions and Answers – Specific Energy – 2

This set of Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Specific Energy – 2”.

1. The dimensions of a rectangular channel are 3m in depth and 4m in width. Calculate the bed slope of the channel if the specific energy is 3.13m. [C=50]
a) 1 in 1000
b) 1 in 1100
c) 1 in 1200
d) 1 in 1300

2. The depth of a trapezoidal channel section is 2m, base width of 3m and has a side slope of 1H:2V. Calculate n if the bed slope is 1 in 1000.
a) 0.012
b) 0.013
c) 0.014
d) 0.015

3. The specific energy of a channel section is 1.01m and the velocity of flow is 0.5m⁄s, calculate the depth of flow.
a) 0.8m
b) 1.0m
c) 1.2m
d) 1.4m

4. Calculate the velocity of flow through a channel having depth of 1.2m and specific energy equal to 1.24m.
a) 0.6 m/s
b) 0.7 m/s
c) 0.8m/s
d) 0.9m/s

5. What is the equation of the curve AB? a) y + $$\frac{Q^2}{2gy}$$
b) y + $$\frac{Q}{2gy}$$
c) y + $$\frac{Q^2}{2gy^2}$$
d) y + $$\frac{Q}{2gy^2}$$

Explanation: The curve AB (Specific Energy curve) is the combination of a parabola and a straight line, hence the valid equation is
y + $$\frac{Q}{2gy^2}$$
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6. What are y1 and y2 in the adjoining graph? a) Conjugate depths
b) Alternate depths
c) Equal depths
d) Sequent depths

Explanation: For a particular specific energy above the minimum specific energy there are two depths called as alternate depths.

7. The specific energy of a rectangular channel having dimensions 2m×3m is 3.095m. Calculate the friction factor.
a) 0.01
b) 0.02
c) 0.03
d) 0.04

8. Calculate the average shear stress for a rectangular channel having depth 0.5m, width 0.8m if the specific energy is 0.56m.
a) 2.32 N/m2
b) 3.32 N/m2
c) 4.32 N/m2
d) 5.32 N/m2

9. Calculate the specific energy for the most economical rectangular channel having depth 2m and width 4m if the bed slope of the channel is 1 in 1200. C = 35.
a) 2.05m
b) 3.05m
c) 4.05m
d) 5.05m

10. Estimate the specific energy for the most economical trapezoidal channel section having depth of 5m, side slope of 1H:4V and bed slope of 1 in 1200.
a) 1.14m
b) 2.14m
c) 3.14m
d) 4.14m

Sanfoundry Global Education & Learning Series – Fluid Mechanics.

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