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In a river, a silt excluder and slit ejector are constructed:


1. At a location after the head regulator and at the head of the canal, respectively
2. At the head of the canal and at a location after the head regulator, respectively
3. At the same location
4. None of these

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Correct Answer - Option 2 : At the head of the canal and at a location after the head regulator, respectively

Explanation:

Silt Regulation works:

The entry of silt into a canal, which takes off from a headworks, can be reduced by constructing certain special works, called silt control works. These works may be classified into the following two types:

  • Silt Excluders
  • Silt Ejectors

Silt Excluders:

  • Silt excluders are those works that are constructed on the bed of the river, upstream of the head regulator.
  • The clearer water enters the head regulator and silted water enters the silt excluder. In this type of works, the silt is, therefore,, removed from the water before in enters the canal.​

Silt Ejector:

  • Silt ejectors, also called silt extractors, are those devices that extract the silt from the canal water after the silted water has traveled a certain distance in the off-take canal.
  • These works are, therefore, constructed on the bed of the canal, and a little distance downstream from the head regulator.

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