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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
1000
1,00,000
4,00,000

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Environmental Engineering
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

59
100
50
75

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Environmental Engineering
The working conditions in imhoff tanks are

Aerobic in lower compartment and anaerobic in upper compartment
anaerobic in lower compartment and aerobic in upper compartment
Anaerobic only
Aerobic only

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Environmental Engineering
The type of valve, which is provided on the suction pipe in a tube-well, is

Air relief valve
Sluice valve
Pressure relief valve
Reflux valve

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Environmental Engineering
Which of the following unit works in anaerobic conditions?

Sludge digestion tank
Activated sludge treatment
Trickling filters
Sedimentation tank

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Environmental Engineering
The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is

Partially separate system
Partially combined system
Separate system
Combined system

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