Fluid Mechanics Questions and Answers – Specific Energy – 1

This set of Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Specific Energy – 1”.

1. What is energy per unit head of water called as __________
a) Total energy
b) Specific energy
c) Velocity head
d) Datum head
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2. What is the plot between Total energy and channel position called as?
a) Specific grade line
b) Energy grade line
c) Datum line
d) Velocity line
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3. Which of the following conditions is not true for an uniform flow?
a) y₁ = y₂
b) S₀ = S_f
c) Z₁ = Z₂
d) V₁ = V₂
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4. Energy per unit weight of water measured with respect to the datum is called as _______
a) Total energy
b) Specific energy
c) Velocity head
d) Datum head
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5. For a given discharge Q and area A, specific energy is constant.
a) True
b) False
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Answer: a
Explanation: Specific energy is constant throughout the channel and is given by

and hence for a given Q and A, E is constant.

6. Calculate the specific energy for a channel having depth 3m and velocity of flow being 1.5 m/s
a) 2.11m
b) 3.11m
c) 4.11m
d) 5.11m
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Answer: b
Explanation:

7. Calculate the specific energy for a rectangular channel having depth 2m and width 3m. Given: Discharge (Q) = 8.78 m³/s.
a) 2.11m
b) 3.11m
c) 4.11m
d) 5.11m
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Answer: a
Explanation:

8. Calculate the specific energy for a triangular channel having depth 4m, side slope 1H:2V and bed slope of 1 in 1000. Given: C = 40.
a) 2.07m
b) 3.07m
c) 4.07m
d) 5.07m
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Answer: c
Explanation:

9. Calculate the specific energy of a trapezoidal channel having depth 2m, base width of 5m and side slope of 1H:2V. Given : S₀= 1/1000 and C = 50.
a) 2.16m
b) 3.16m
c) 4.16m
d) 5.16m
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Answer: a
Explanation:

10. A circular channel has diameter of 6m, calculate the specific energy of the channel if the bed slope of the channel is 1 in 1000. Given: C = 60.
a) 5.27m
b) 6.27m
c) 7.27m
d) 8.27m
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Answer: b
Explanation:

11. The specific energy of a triangular channel is 5.06m and the depth of the channel is 5m having side slope of 1H:4V then calculate the value of C. Given: S₀=1 in 1000.
a) 40
b) 45
c) 50
d) 55
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Answer: b
Explanation:

Sanfoundry Global Education & Learning Series – Fluid Mechanics.

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