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Environmental Engineering

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

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

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Environmental Engineering
The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of

1000 mg/liter
100 mg/liter
10 mg/liter
1 mg/liter

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Environmental Engineering
Which of the following retards the self purification of stream?

Higher temperature
Satisfying oxygen demand
None of these
Sunlight

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Environmental Engineering
The gas from sludge digestion tank is mainly composed of

Methane
Nitrogen
Hydrogen sulphide
Carbon dioxide

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Environmental Engineering
The pathogens can be killed by

Oxidation
None of these
Chlorination
Nitrification

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Environmental Engineering
Laying of sewers is usually done with the help of

Sight rails and boning rods
A plane table
A Theodolite
A compass

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