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
- a steady 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 *y _{1}* at the vena-contracta.

*y*is the sequent depth corresponding to

_{2}*y*. If the

_{1}**tailwater depth**

*y*is

_{t}**larger**than

*y*, then :

_{2}- a repelled jump occurs
- a free jump occurs
- a submerged jump takes place
- no jump takes place

### Question No.12

If *y _{2}* =

**sequent depth**for a

**rectangular channel**obtained by assuming

**horizontal frictionless**channel in the momentum equation and

*y*= corresponding

_{2a}**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 = *L _{js}* and the corresponding

**length of the jump**in a

**horizontal rectangular**channel having same

*y*and

_{1}*F*is

_{1}*L*, then :

_{j}- \[{L_j} > {L_{js}}\]
- \[{L_{js}} > {L_j}\]
- \[{L_j} = {L_{js}}\]
- \[{L_j}/{L_{js}} = 0.80\]

### Question No.14

If *E _{LS}* =

**energy loss**in a jump in a

**sloping rectangular**channel and

*E*=

_{LH}**energy loss**in a corresponding jump on a

**horizontal rectangular**channel having the same

*y*and

_{1}*F*, then :

_{1}- \[{E_{LH}} = {E_{LS}}\]
- \[{E_{LH}} > {E_{LS}}\]
- \[{E_{LH}} < {E_{LS}}\]
- \[{E_{LH}}/{E_{LS}} = 0.80\]

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)

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