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Waste Water Engineering

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

Rectangular
Parabolic
New egged
Circular

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Waste Water Engineering
The most dangerous pollutant in vehicular emissions is

SO₂
CO₂
CO₂
O₂

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Waste Water Engineering
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is

100 cm
50 cm
90 cm
80 cm

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Waste Water Engineering
For efficient working of a sewer, it must be ensured that

Both (A) and (B)
A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
Neither (A) nor (B)
Minimum velocity of 0.45 m/sec, is maintained at its minimum flow

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Waste Water Engineering
Sewer ventilating columns are generally placed at

All listed here
Every change in the size of sewers
Distances 150 m to 300 m
Upper ends of branch sewers

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Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

None of these
A particle to travel along its length
A particle to travel from top surface to bottom sludge zone
The flow of sewage to fill the tank

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