# Open Channel Flow MCQ – Hydraulic Jump – Set 1 (14 MCQs)

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#### Open Channel Flow MCQ – Hydraulic Jump – Set 1 (14 MCQs)

The following post contains Multiple Choice Questions (MCQ) covering "Hydraulic Jump" of Open Channel Flow / Hydraulics. Try answering the questions by yourself. Then you can check the model answers for those Open Channel Flow MCQ on the following link :

Open Channel Flow MCQ - Hydraulic Jump - Set 1 (Model Answer)

These Open Channel Flow MCQ covers the following topics / points of "Hydraulic Jump" :

• Introduction to Rapidly Varied Flow RVF (Hydraulic Jumps)
• Momentum Equation Formulation for Hydraulic Jumps
• Hydraulic Jump in a Rectangular Horizontal Channel
• Hydraulic Jump in a Non-rectangular Horizontal Channel
• Hydraulic Jump on a Sloping Bed
• Uses of Hydraulic Jumps as Energy Dissipators
• Location of Hydraulic Jumps

The following Open Channel Flow MCQ is important for engineering students and professionals while getting ready for different engineering competitive exams. For any help, you can contact us through the comments and we will reply to you as soon as possible. You can also contact us through the following email author@3nn.4fe.myftpupload.com.

## Open Channel Flow MCQ - Hydraulic Jump - Set 1

### Question No.1

The hydraulic jump is a phenomenon :

• in which the water surface connects the alternate depths
• which occurs only in frictionless channels
• which occurs only in rectangular channels
• none of these

### Question No.2

A hydraulic jump occurs when there is a break in grade from a :

• mild slope to steep slope
• steep slope to mild slope
• steep slope to steeper slope
• mild slope to milder slope

### Question No.3

The sequent-depth ratio in a hydraulic jump formed in a horizontal rectangular channel is 16.48. The Froude number of the supercritical stream is :

• 8.0
• 4.0
• 20.0
• 12.0

### Question No.4

The Froude number of a subcritical stream at the end of a hydraulic jump in a horizontal rectangular channel is 0.22. The sequent-depth ratio of this jump is :

• 11.25
• 15.25
• 8.35
• 6.50

### Question No.5

If the Froude number of a hydraulic jump is 5.50, it can be classified as :

• an oscillating jump
• a weak jump
• a strong jump

### Question No.6

The initial depth of a hydraulic jump in a rectangular channel is 0.2 m and the sequent-depth ratio is 10. The length of the jump is about :

• 4 m
• 6 m
• 12 m
• 20 m

### Question No.7

In a hydraulic jump taking place in a horizontal rectangular channel the sequent depths are 0.30 m and 1.50 m respectively. The energy loss in this jump is :

• 1.92 m
• 1.50 m
• 0.96 m
• 1.20 m

### Question No.8

Seventy per cent of the initial energy is lost in a jump taking place in a horizontal rectangular channel. The Froude number of the flow at the toe is :

• 4.0
• 9.0
• 20.0
• 15.0

### Question No.9

In a hydraulic jump occurring in a horizontal rectangular channel with an initial Froude number of 12, the sequent depth ratio is found to be 13.65. The energy dissipation as a percentage of the initial specific energy is about :

• 62 {d8436e6188dc3d199bf8c3981ea7a790e12a890a66b7d0a0d43491ce624dcb00}
• 50 {d8436e6188dc3d199bf8c3981ea7a790e12a890a66b7d0a0d43491ce624dcb00}
• 87 {d8436e6188dc3d199bf8c3981ea7a790e12a890a66b7d0a0d43491ce624dcb00}
• 73 {d8436e6188dc3d199bf8c3981ea7a790e12a890a66b7d0a0d43491ce624dcb00}

### Question No.10

The concept of constancy of specific force at the beginning and the end of a hydraulic jump :

• assumes horizontal frictionless channel
• is valid for jumps in a rectangular sloping floor basin
• is valid for all kinds of channels provided the friction can be assumed to be negligibly small
• assumes constancy of specific energy

### Question No.11

A sluice gate discharges a flow with a depth of y1 at the vena-contracta. y2 is the sequent depth corresponding to y1. If the tailwater depth yt is larger than y2, then :

• a repelled jump occurs
• a free jump occurs
• a submerged jump takes place
• no jump takes place

### Question No.12

If y2 = sequent depth for a rectangular channel obtained by assuming horizontal frictionless channel in the momentum equation and y2a = corresponding actual sequent depth measured in a horizontal rectangular channel having high friction, one should expect :

• ${y_2} > {y_{2a}}$
• ${y_2} = {y_{2a}}$
• ${y_2} < {y_{2a}}$
• ${y_2} \le {y_{2a}}$

### Question No.13

If the length of the jump in a sloping rectangular channel = Ljs and the corresponding length of the jump in a horizontal rectangular channel having same y1 and F1 is Lj, then :

• ${L_j} > {L_{js}}$
• ${L_{js}} > {L_j}$
• ${L_j} = {L_{js}}$
• ${L_j}/{L_{js}} = 0.80$

### Question No.14

If ELS = energy loss in a jump in a sloping rectangular channel and ELH = energy loss in a corresponding jump on a horizontal rectangular channel having the same y1 and F1, then :

• ${E_{LH}} = {E_{LS}}$
• ${E_{LH}} > {E_{LS}}$
• ${E_{LH}} < {E_{LS}}$
• ${E_{LH}}/{E_{LS}} = 0.80$

After you have checked the Open Channel Flow MCQ, you can check the model answers for those MCQ on the following link :

Open Channel Flow MCQ - Hydraulic Jump - Set 1 (Model Answer)