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Waste Water Engineering

Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/4
D/3
D/1
D/2

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Waste Water Engineering
Dry weather flow is:

Average monthly rate of flow
Water supply allowance per capita
Average annual rate of flow
Average daily rate of flow

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Waste Water Engineering
In septic tanks, decomposition of organic bacteria, is done by

Both types of bacterias
Anaerobic bacteria
None of these
Aerobic bacteria

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Waste Water Engineering
The intensity of rain is expressed in

cm/hour
cm/day
None of these
cm/minute

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Waste Water Engineering
In sewers the effect of scouring is more on

Bottom side
Top side
All sides
Horizontal side

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Waste Water Engineering
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done

Hydraulically
Manually
Electrically
Mechanically

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