Fluid Mechanics Questions and Answers – Gradually Varied Flow(GVF) – 3

This set of Fluid Mechanics Objective Questions & Answers focuses on “Gradually Varied Flow(GVF) – 3”.

1. Determine the value of the hydraulic depth of a channel having ^dy⁄_dx = 4×10^-4 and ^dE⁄_dx = 3.73×10^-4. Given:V = 1m/s
a) 0.5m
b) 1.5m
c) 2.5m
d) 3.5m
View Answer

Answer: b
Explanation:

2. A rectangular channel has depth of 1m and width of 2m, calculate the rate of change of depth if the rate of change of specific energy is 2×10^-5m. Given: F_r=0.48.
a) 0.60×10^-5m
b) 1.60×10^-5m
c) 2.60×10^-5m
d) 3.60×10^-5m
View Answer

Answer: c
Explanation:

3. The top width of a triangular channel section is 6m and the side slope of the channel is 1H:4V, calculate the rate of change of specific energy if ^dy⁄_dx = 2×10^-5m and V=2 m/s
a) 1.86×10^-5m
b) 2.86×10^-5m
c) 3.86×10^-5m
d) 4.86×10^-5m
View Answer

Answer: a
Explanation:

4. If ^dE⁄_dx = 2.5×10^-4 m and ^dy⁄_dx = 3.5×10^-4 m, calculate the value of F_r.
a) 0.23
b) 0.33
c) 0.43
d) 0.53
View Answer

Answer: d
Explanation:

5. The rate of change of specific energy is given by x²/2 and x ranges from 0 to 3, calculate the value of specific energy.
a) 2.5m
b) 3.5m
c) 4.5m
d) 5.5m
View Answer

Answer: c
Explanation:

6. The rate of change of depth is given by 1/x² and the rate of change of specific energy is given by 3x² with x ranging from 0 to 0.2, calculate the value of Froude’s number.
a) 0.96
b) 0.97
c) 0.98
d) 0.99
View Answer

Answer: d
Explanation:

7. The hydraulic depth of a channel is 0.94m and the velocity of flow is 2 m/s. Calculate the rate of change of depth if the rate of change of specific energy is 2.5×10^-4m.
a) 2.33×10^-4m
b) 3.33×10^-4m
c) 4.33×10^-4m
d) 5.33×10^-4m
View Answer

Answer: c
Explanation:

8. Calculate the value of Froude’s number for a rectangular channel having depth 1.5m and width 2.5m if the value of C = 30 and S₀=1 in 1000.
a) 0.1
b) 0.2
c) 0.3
d) 0.4
View Answer

Answer: b
Explanation:

9. The dynamic equation for the slope of water surface in a GVF is not valid for super critical flow.
a) True
b) False
View Answer

Answer: a
Explanation:

10. If the ratio of ^dE⁄_dx and ^dy⁄_dx is 0.2823, estimate the value of Froude’s number.
a) 0.65
b) 0.75
c) 0.85
d) 0.95
View Answer

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