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Environmental Engineering

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

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

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Environmental Engineering
Air binding phenomena in rapid sand filters occur due to

Low temperature
Higher turbidity in the effluent
Mud ball formation
Excessive negative head

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

Rainfall + 6 DWF
Equal to rainfall
Rainfall + DWF
Rainfall + 2 DWF

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Environmental Engineering
The maximum discharge of a tube well is about

50 liters/sec
1000 liters/sec
500 liters/sec
5 liters/sec

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Environmental Engineering
A sewer that receives the discharge of a number of house sewers is called

Sub-main sewer
Lateral sewer
Intercepting sewer
House sewer

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Environmental Engineering
The water carriage system of collection of waste product

Is cheaper in initial cost than dry conservancy system
All of these
Creates hygienic problem
Requires treatment before disposal

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