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Environmental Engineering

Environmental Engineering
The percentage of chlorine in fresh bleaching powder is about

40 to 50
30 to 35
10 to 15
20 to 25

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Environmental Engineering
An egg shaped section of sewer

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

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Environmental Engineering
Settling velocity increases with

Temperature of liquid
Depth of tank
Specific gravity of solid particles
Size of particles

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Environmental Engineering
Disinfection efficiency is

Highest at pH value equal to 7
Reduced at higher pH value of water
Unaffected by pH value of water
Increased at higher pH value of water

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Environmental Engineering
Chlorine demand of water is equal to

Applied chlorine
Difference of applied and residual chlorine
Residual chlorine
Sum of applied and residual chlorine

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Environmental Engineering
The most commonly used sewer under culverts is

Circular cast iron sewer
Circular brick sewer
Semi-elliptical sewer
Horseshoe type sewer

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