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Environmental Engineering

Environmental Engineering
Orthotolidine test is used for determination of

Residual chlorine
Dose of coagulant
Dissolved oxygen
Biochemical oxygen demand

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Environmental Engineering
The effect of increasing diameter of sewer on the self cleansing velocity is

To increase it
Nil
Fluctuating
To decrease it

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Environmental Engineering
An egg shaped section of sewer

Provides self cleansing velocity at low discharges
Is economical than circular section
Is more stable than circular section
Is easy to construct

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Environmental Engineering
The slope of sewer shall be

Given in the direction of natural slope of ground
Zero
Steeper than 1 in 20
Given in the direction opposite to natural slope of ground

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Environmental Engineering
The phenolic compounds in public water supply should not be more than

0.1 ppm
0.001 ppm
0.0001 ppm
0.01 ppm

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Environmental Engineering
The characteristics of fresh and septic sewage respectively are

Both acidic
Alkaline and acidic
Acidic and alkaline
Both alkaline

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