Environmental Engineering
The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally

Less and more
More and more
Less and less
More and less

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Environmental Engineering
Scour valves are provided

At the foot of rising main along the slope to prevent back running of water
At street corners to control the flow of water
At every depression and dead ends to drain out the waste water that may collect there
At every summit of rising mains

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Environmental Engineering
The polluted water is one which

Contains pathogenic bacteria
Consists of undesirable substances rendering it unfit for drinking and domestic use
Is contaminated
Is safe and suitable for drinking and domestic use

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Environmental Engineering
In lime-soda process

Only carbonate hardness is removed
Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness
Only noncarbonated hardness is removed
Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness

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