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Test: Sediment Transport & Design of Irrigation Channel - 2


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10 Questions MCQ Test GATE Civil Engineering (CE) 2023 Mock Test Series | Test: Sediment Transport & Design of Irrigation Channel - 2

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Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 1

A stable channel has three degrees of freedom in the sense that the depth, width and slope can adjust to the given discharge and sediment conditions. In this sense which of the following methods of canal design gives a true regime channel for silt laden flow in fine alluvium?

Detailed Solution for Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 1

According to Lacey’s theory the dimensions of bed width, depth and slope of canal attain a state of equilibrium with time which is called true regime state. Lacey defined a regime channel as a stable channel transporting a minimum bed load consistent with fully active bed.

Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 2

If it is required to design a stable channel for a given discharge in an alluvial material of known median size, it can be done by least number of assumptions concerning the important variables by using

Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 3

Lacey, in his regime equations, has adjusted his silt factor to be unity for the standard silt used by Kennedy. It is known that Kennedy used Bari-Doab alluvium as the standard silt in his equation. Then, the median size, in mm, of Bari-Doab alluvium and the critical velocity ratio for this silt are, respectively

Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 4

Average bed material load of a regime channel conforming to Lacey equations will be of the order of

Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 5

The total number of independent equations that form the Lacey's regime theory is

Detailed Solution for Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 5

Lacey collected a large number of data of stable channels in Indo-Ganetic plains. Analyzing the data he gave the following equations of regime channel relating regime velocity Vc, silt factor f, hydraulic radius R, area A, sediment size in mm and bed slope S,

These four equations are the Lacey’s basic regime flow equations.

Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 6

The velocity of flow in a channel with a depth of 1 mt calculated by Kennedy’s theory with a critical velocity ratio as 1.2 is

Detailed Solution for Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 6

Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 7

A regime channel has a discharge of 100 m3/s. It will have a perimeter of

Detailed Solution for Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 7

Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 8

When an alluvial channel attains its regime it will have side slopes

Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 9

For medium silt whose average grain size is 0,16 mm, Lacey’s silt factor is likely to be

Detailed Solution for Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 9

Lacey’s silt factor,

Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 10

The Lacey’s silt factor for a particular alluvium is 2.0. This alluvium would comprise

Detailed Solution for Test: Sediment Transport & Design of Irrigation Channel - 2 - Question 10

Lacey’s silt factor,

∴ 

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