Environmental Engineering
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be

Partially combined system
Separate system
Partially separate system
Combined system

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

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

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