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Environmental Engineering

Environmental Engineering
Orthotolidine test is used for determination of

Dose of coagulant
Dissolved oxygen
Residual chlorine
Biochemical oxygen demand

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Environmental Engineering
Standard BOD is measured at

20°C - 1 day
30°C - 5 day
20°C - 5 day
25°C - 3 day

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Environmental Engineering
If the average daily consumption of a city is 100,000 m³, the maximum daily consumption on peak hourly demand will be

150000 m³
100000 m³
270000 m³
180000 m³

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Environmental Engineering
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is

Sluice valve
Pressure relief valve
Air relief valve
Reflux valve

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Environmental Engineering
If the sewage contains grease and fatty oils, these are removed in

Sedimentation tanks
Grit chambers
Detritus tanks
Skimming tanks

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Environmental Engineering
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

Greater than HMD when flowing full
Less than HMD when flowing full
Equal to HMD when flowing full
None of these

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