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Environmental Engineering

Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

15 to 30 cm/sec
15 to 30 cm/minute
5 to 10 cm/sec
15 to 30 cm/hour

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

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

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Environmental Engineering
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to

Total hardness total alkalinity
Non carbonate hardness
Total alkalinity
Total hardness

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Environmental Engineering
A sewer that receives the discharge of a number of house sewers is called

Intercepting sewer
House sewer
Sub-main sewer
Lateral sewer

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

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

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Environmental Engineering
The characteristics of fresh and septic sewage respectively are

Both alkaline
Acidic and alkaline
Both acidic
Alkaline and acidic

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