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Waste Water Engineering

Waste Water Engineering
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

60 days
15 days
90 days
30 days

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Waste Water Engineering
In sewers the gas generally found, is

Carbon dioxide (CO2)
All listed here
Methane (CH4)
Hydrogen sulphide (H2S)

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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

Nitric acid
Citric acid
Hydrochloric acid
Sulphuric acid

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Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains

Oxygen
Carbon dioxide
Methane
Hydrogen sulphide

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Waste Water Engineering
Rate of flow of sewage is generally assumed

More than the rate of water supply
At 150 litres per capita
Less than the rate of water supply
Equal to the rate of water supply

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Waste Water Engineering
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is

pt = 2H3p/3 Z5
pt = 3H3p/2 Z5
pt = 3H3p/2 Z5
pt = 2H3p/3 Z5

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MORE MCQ ON Waste Water Engineering

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