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Environmental Engineering

Environmental Engineering
The design discharge for the separate sewer system shall be taken as

3 × DWF
6 × DWF
Equal to dry weather flow (DWF)
2 × DWF

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Environmental Engineering
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

0.4 to 1.0
2 to 4
0.2 to 0.4
5 to 7

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Environmental Engineering
The type of sewer which is suitable for both combined and separate system is

Semi-elliptical sewer
Horseshoe type sewer
Egg shaped sewer
Circular sewer

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Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

1,00,000
4000
4,00,000
1000

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Environmental Engineering
The alum, when added as a coagulant in water

Increases pH value of water
Decreases pH value of water
Does not require alkalinity in water for flocculation
Does not affect pH value of water

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Environmental Engineering
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called

Soil pipe
Vent pipe
Waste pipe
Anti-siphonage pipe

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