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Waste Water Engineering

Waste Water Engineering
The sewer which received discharge from two or more main sewers, is known as

An intercepting sewer
A trunk sewer
A main sewer
An outfall sewer

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Waste Water Engineering
Flocculated particles do not change their

Weight
Shape
None of these
Size

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Waste Water Engineering
A drop manhole is provided if

None of these
A lamp is inserted to check obstruction
A sewer drops from a height
A branch sewer joins the main sewer at higher level

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Waste Water Engineering
The presence of free ammonia in sewage, is detected by

Phenol-di-sulphuric acid
Adding sulphuric acid
Boiling
Adding potassium permanganate

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Waste Water Engineering
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

0.88 m
1.76 m
1.36 m
0.68 m

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Waste Water Engineering
Design period of 40 to 50 years is adopted for

Main sewers
Trunk sewers
Branch sewers
All listed here

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