# Test: Flow Through Open Channels - 3

## 20 Questions MCQ Test Topicwise Question Bank for Civil Engineering | Test: Flow Through Open Channels - 3

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Attempt Test: Flow Through Open Channels - 3 | 20 questions in 60 minutes | Mock test for Civil Engineering (CE) preparation | Free important questions MCQ to study Topicwise Question Bank for Civil Engineering for Civil Engineering (CE) Exam | Download free PDF with solutions
QUESTION: 1

### Which of the following conditions are applicable for critical flow

Solution:

For a critical flow: Or, QUESTION: 2

### The Chezy’s constant C in the Chezy’s equation for mean velocity in open channels is

Solution:

Chezy’s equation, V = Substituting dimensions of each term in above equation. QUESTION: 3

### The conveyance K of a channel is a measure of its carrying capacity. In terms of K, the discharge Q is given by

Solution:

Conveyance K = 1/n(AR2/3). It expresses the discharge capacity of the channel per unit longitudinal slope.

QUESTION: 4

A steady discharge of 1 cumec flows uniformly in a rectangular channel 1 m wide at a depth of 250 mm. The slope of the channel bed is

Solution:

Critical depth of flow :
q = Q/B = 1 ⇒ Yc = 0.467
Yc = 0.5
And normal depth of flow = yn = 0.25 m
since yn < yc therefore channel has steep slope.

QUESTION: 5

In case of a hydraulic jump in a rectangular channel, the post jump, depth d2, when Froude number F1 is √3 , is
where d1 = pre-jump depth

Solution: QUESTION: 6

The flow characteristic before and after a hydraulic jump are such that:

Solution:

The loss of energy in a hydraulic jump leads to unequal specific energies at downstream and upstream sections.

QUESTION: 7

The figure below shows a gradually varied flow situation in an open channel with a break in bed slope. Types of water surface profiles occurring from left to right are Solution:
QUESTION: 8

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

Solution: QUESTION: 9

An open channel carries water with a velocity of 0.605 m/s. If the average bed shear stress is 1.0 N/m2, then the Chezy’s constant C is equal to

Solution:

As we know, Dividing (i) by (ii) we get, QUESTION: 10

The Chezy’s and Manning’s formulae are related by

Solution:

The Manning’s n, Chezy’s C and Darcy-Weisbach’s 'f' are related as, QUESTION: 11

Open channel flow is the one in which

Solution:

Flow in a conduit with a free surface is known as open channel flow, flows in irrigation channels, streams and rivers, navigation channels, drainage channels and severs are some examples of open channel flow.

QUESTION: 12

In a subdritica! flow, as the specific energy in a channel is decreased, the depth of flow

Solution:
QUESTION: 13

If the specific energy at the upstream section of a rectangular channel is 3 m and minimum specific energy is 2.5 m, the maximum height of jump without causing afflux will be

Solution:
QUESTION: 14

If the Froude’s number before a hydraulic jump occurring in a rectangular horizontal channel is √10 then the Froude’s number after the jump will be

Solution:  Or ∴ QUESTION: 15

Least possible value of correction factor for
1. kinetic energy is zero
2. kinetic energy is 1
3. momentum is zero
4. momentum is 1
The correct statements are

Solution:
QUESTION: 16

If velocity is zero over 1/3rd of a cross-section and is uniform over remaining 2/3rd of the cross- section, then the correction factor for kinetic energy is

Solution:
QUESTION: 17

The depth of flow for maximum velocity in a circular channel section with diameter equal to 1.5 m is

Solution:
QUESTION: 18

The critical depth of flow in a most economical triangular channel section for a discharge of 1 m3/sec is given by

Solution:
QUESTION: 19

The mild slope profile M2 ocdufs for depth

Solution:
QUESTION: 20

Gradually varied flow in open channel is caused when

Solution:

If the flow is subcritical, then after the introduction of hump the specific energy will decrease by ΔZ (height of hump).  Use Code STAYHOME200 and get INR 200 additional OFF Use Coupon Code