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Waste Water Engineering

Waste Water Engineering
Before discharging the foul sewage into rivers, it is generally treated by

Sedimentation
All listed here
Oxidation
Screening

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Waste Water Engineering
The suitable cross-section of sewers to carry combined flow, is

Egg shaped
Rectangular
Horse shoe shaped
Circular

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Waste Water Engineering
For a continuous flow type of sedimentation tanks

Width of the tank is normally kept about 6 m
Length of the tank is normally kept 4 to 5 times the width
Maximum horizontal flow velocity is limited to 0.3 m/minute
All listed here

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Waste Water Engineering
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed

2
2.5
3
1.5

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Waste Water Engineering
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

Methane
Oxygen
Carbon dioxide
Hydrogen sulphide

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Waste Water Engineering
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of

Sulphuric acid
Hydrochloric acid
Nitric acid
Citric acid

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MORE MCQ ON Waste Water Engineering

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