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Waste Water Engineering

Waste Water Engineering
Clogging of sewers, is caused due to

Silting
Greasy and oily matters
Low discharge
All of these

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Waste Water Engineering
Drop manholes are the manholes

With depths more than 3.5 m
Without manhole covers
Having drains at different levels
Without entry ladders

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Waste Water Engineering
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

Under estimates of maximum and average flows
Unexpected large scale infiltration of stream water
All of these
Unexpected increase in the population

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Waste Water Engineering
When drainage to sewage ratio is 20, the peak dry weather flow is

None of these
Slightly more than 5% of the design discharge
20% of the design discharge
Slightly less than 5% of the design discharge

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Waste Water Engineering
The sewage treatment in septic tanks is due to

Anaerobic decomposition
Aerobic decomposition
Parasitic decomposition
None of these

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Waste Water Engineering
The most efficient cross-section of sewers in a combined sewerage system is

New egged
Circular
Parabolic
Rectangular

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