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Environmental Engineering

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

Detritus tanks
Sedimentation tanks
Skimming tanks
Grit chambers

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Environmental Engineering
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be

Partially combined system
Partially separate system
Combined system
Separate system

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Environmental Engineering
The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is

Reinforced cement concrete
Steel
Cast iron
Copper

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Environmental Engineering
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is

4 ppm
10 ppm
1 ppm
40 ppm

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

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Environmental Engineering
The effective size of sand particles used in slow sand filters is

0.25 to 0.35 mm
1.00 to 1.80 mm
0.60 to 1.00 mm
0.35 to 0.60 mm

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