# 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

Hence energy per unit head is called as total energy.

2. What is the plot between Total energy and channel position called as?
c) Datum line
d) Velocity line

Explanation: The graph between total energy and channel position gives the distribution of energy along the channel and hence the plot is called energy grade line.

3. Which of the following conditions is not true for an uniform flow?
a) y1 = y2
b) S0 = Sf
c) Z1 = Z2
d) V1 = V2

Explanation: In a uniform flow through a channel the depth, slopes and the velocity of flow remains constant throughout the channel but the datum head may or may not be the same.

4. Energy per unit weight of water measured with respect to the datum is called as _______
a) Total energy
b) Specific energy

Explanation: Specific energy is the energy constant throughout the channel and is estimated with respect to the datum.

5. For a given discharge Q and area A, specific energy is constant.
a) True
b) False

Explanation: Specific energy is constant throughout the channel and is given by

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

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

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

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

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

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

Explanation:

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