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Environmental Engineering

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

Higher temperature
Sunlight
Satisfying oxygen demand
None of these

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Environmental Engineering
The specific gravity of sewage is

Much greater than 1
Equal to 1
Slightly less than 1
Slightly greater than 1

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

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

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Environmental Engineering
The self cleansing velocity for all sewers in India is usually

1.5 m/sec to 2.0 m/sec
Less than 1.0 m/sec
3.0 m/sec to 3.5 m/sec
1.0 m/sec to 1.2 m/sec

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Environmental Engineering
The distribution mains are designed for

Maximum daily demand
Average daily demand
Maximum hourly demand
Maximum hourly demand on maximum day

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Environmental Engineering
The suitable layout of a distribution system for irregularly growing town is

Grid iron system
Ring system
Dead end system
Radial system

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