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
Safety valve
Sluice valve
Scour valve

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Environmental Engineering
The major disadvantage of lime soda process of water softening is that

It is unsuitable for softening the water of excessive hardness
Huge amount of precipitate is formed which creates a disposal problem
The effluent cannot be reduced to zero hardness
It is unsuitable for turbid and acidic water

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