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Environmental Engineering

Environmental Engineering
Period of cleaning of slow sand filters is about

24 - 48 hours
1 - 2 year
10 - 12 days
2 - 3 months

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Environmental Engineering
For a given discharge, the efficiency of sedimentation tank can be increased by

Increasing the surface area of tank
Decreasing the depth of tank
Increasing the depth of tank
Decreasing the surface area of tank

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Environmental Engineering
The depression of water table in a well due to pumping will be maximum(Where ‘R’ is the radius of influence)

At a distance R from the well
At a distance R/2 from the well
Close to the well
None of these

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Environmental Engineering
The effect of increasing diameter of sewer on the self cleansing velocity is

To decrease it
To increase it
Fluctuating
Nil

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Environmental Engineering
A sewer that receives the discharge of a number of house sewers is called

Lateral sewer
Sub-main sewer
House sewer
Intercepting sewer

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Environmental Engineering
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is

Check valve
Sluice valve
Scour valve
Safety valve

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