Environmental Engineering
The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is

Circle method
Equivalent pipe method
Hardy cross method
Electrical analysis method

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

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

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Environmental Engineering
Double filtration is used

All of these
To increase the filtration rapid sand filters capacity of
To increase the filtration slow sand filters capacity of
For isolated buildings like pools, hotels etc swimming

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