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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(AR^{2/3}). 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

⇒ Y_{c }= 0.467

Y_{c }= 0.5

And normal depth of flow = y_{n} = 0.25 m

since y_{n} < y_{c} therefore channel has steep slope.

QUESTION: 5

In case of a hydraulic jump in a rectangular channel, the post jump, depth d_{2}, when Froude number F_{1} is √3 , is

where d_{1} = 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/m^{2}, 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 m^{3}/sec is given by

Solution:

QUESTION: 19

The mild slope profile M_{2} 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).

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