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Test: Sediment Transport & Design of Irrigation Channel - 2 - Civil Engineering (CE) MCQ


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10 Questions MCQ Test GATE Civil Engineering (CE) 2025 Mock Test Series - Test: Sediment Transport & Design of Irrigation Channel - 2

Test: Sediment Transport & Design of Irrigation Channel - 2 for Civil Engineering (CE) 2024 is part of GATE Civil Engineering (CE) 2025 Mock Test Series preparation. The Test: Sediment Transport & Design of Irrigation Channel - 2 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Sediment Transport & Design of Irrigation Channel - 2 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Sediment Transport & Design of Irrigation Channel - 2 below.
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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

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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

Explanation

  • A rigid bed canal has one degree of freedom i.e. for a given channels a change in discharge would cause a change in the depth only.
  • A man –made alluvial channel has three degree of freedom i.e. for a given channel, change in discharge can cause changes in width, depth and bed slope.
  • Thus three equations independent of each other are needed, as given by Lacey, to represent three degrees of freedom viz. depth, width and gradient.
  • A natural alluvial river has four degree of freedom as its planiform can also after.
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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