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Civil Engineering (CE) Exam  >  Civil Engineering (CE) Tests  >  GATE Civil Engineering (CE) 2025 Mock Test Series  >  Test: Flow Through Open Channels - 2 - Civil Engineering (CE) MCQ

Test: Flow Through Open Channels - 2 - Civil Engineering (CE) MCQ


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10 Questions MCQ Test GATE Civil Engineering (CE) 2025 Mock Test Series - Test: Flow Through Open Channels - 2

Test: Flow Through Open Channels - 2 for Civil Engineering (CE) 2024 is part of GATE Civil Engineering (CE) 2025 Mock Test Series preparation. The Test: Flow Through Open Channels - 2 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Flow Through Open Channels - 2 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Flow Through Open Channels - 2 below.
Solutions of Test: Flow Through Open Channels - 2 questions in English are available as part of our GATE Civil Engineering (CE) 2025 Mock Test Series for Civil Engineering (CE) & Test: Flow Through Open Channels - 2 solutions in Hindi for GATE Civil Engineering (CE) 2025 Mock Test Series course. Download more important topics, notes, lectures and mock test series for Civil Engineering (CE) Exam by signing up for free. Attempt Test: Flow Through Open Channels - 2 | 10 questions in 30 minutes | Mock test for Civil Engineering (CE) preparation | Free important questions MCQ to study GATE Civil Engineering (CE) 2025 Mock Test Series for Civil Engineering (CE) Exam | Download free PDF with solutions
Test: Flow Through Open Channels - 2 - Question 1
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A right-angled triangular channel symmetrical in section about the vertical carries a discharge of 5 m3/s with a velocity of 1.25 m/s. What is the approximate value of the Froude number of the flow?

Detailed Solution for Test: Flow Through Open Channels - 2 - Question 1

We know that,
Q = AV
⇒ 5 = A x 1.25 ⇒ A = 4 m2
For a symmetrical right angled triangular channel,
m = 1
∴ A = my2 = 1 x y2 = y2
T = 2my = 2 x 1 x y = 2y
But A = 4 m2
⇒ y2 = 4   ⇒ y = 2 m

Test: Flow Through Open Channels - 2 - Question 2
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A rectangular channel is 5 m wide and 3 m deep. Water is flowing in the channel for a depth of 2.5 m. The hydraulic radius is

Detailed Solution for Test: Flow Through Open Channels - 2 - Question 2

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Test: Flow Through Open Channels - 2 - Question 3
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Flow depths across a sluice gate are 2.0 m and 0.5 m. What is the discharge (per metre width)?

Detailed Solution for Test: Flow Through Open Channels - 2 - Question 3


Test: Flow Through Open Channels - 2 - Question 4
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Given that
S0 = slope of the channel bottom
Se = slope of the energy line
F = Froude number
the equation of gradually varied flow is expressed as
Test: Flow Through Open Channels - 2 - Question 5
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A rectangular channel is 6 m wide and discharges 30 m3s-1. The upstream depth is 2.0 m, acceleration due to gravity is 10 ms-2. Then, what is the specific energy (approximate)?
Detailed Solution for Test: Flow Through Open Channels - 2 - Question 5

We know that, 
Q = AV

⇒ 30 = 6 x 2 x V
⇒  \/ = 2.5 m/s
The specific energy may be given as,

Test: Flow Through Open Channels - 2 - Question 6
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Most efficient channel section is
Test: Flow Through Open Channels - 2 - Question 7
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For a smooth hump in a subcritical flow to function as a broad crested weir, the height ΔZ of the hump above the bed must satisfy which one of the following?
(E1 = Specific head upstream of the hump, Ec = Specific head at the critical" depth yc) (Neglect friction effects)
Detailed Solution for Test: Flow Through Open Channels - 2 - Question 7

If the flow is subcritical, then after the introduction of hump the specific energy will decrease by ΔZ (height of hump).
E0 ≤  E1 - ΔZ 
⇒ ΔZ ≤ (E1 - E0)

Test: Flow Through Open Channels - 2 - Question 8
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A hydraulic jump occurs at the top of a spillway. The depth before jump is 0.2 m. The sequent depth is 3.2 m. What is the energy dissipated in m (approximate)?
Detailed Solution for Test: Flow Through Open Channels - 2 - Question 8

The energy dissipation is given by,

Test: Flow Through Open Channels - 2 - Question 9
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What is the normal depth in a wide rectangular channel carrying 0.5 m2/s discharge at a bed slope of 0.0004 and Manning’s n = 0.01?
Detailed Solution for Test: Flow Through Open Channels - 2 - Question 9

For a wide rectangular channel, the hydraulic radius (F) is approximately equal to the depth of flow. By Manning’s equation, we have,


Test: Flow Through Open Channels - 2 - Question 10
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Match List-I (Flow section type) with List-ll (Critical discharge is proportional to) where y is the depth of flow-and select the correct answer using the codes given below the lists:
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