Environmental Engineering
The settling velocity of a particle in a sedimentation tank depends on

Surface area of tank
Both depth and surface area of tank
Depth of tank
None of these

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

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

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