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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

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

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Environmental Engineering
For a given discharge, the efficiency of sedimentation tank can be increased by

Decreasing the depth of tank
Decreasing the surface area of tank
Increasing the surface area of tank
Increasing the depth of tank

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Environmental Engineering
The velocity of flow does not depend on

Hydraulic mean depth of sewer
Roughness of sewer
Grade of sewer
Length of sewer

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

Sunlight
Satisfying oxygen demand
Higher temperature
None of these

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

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

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Environmental Engineering
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is

Scour valve
Sluice valve
Check valve
Safety valve

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