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.Management Sciences
Category: Waste Water Engineering
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains__________________?
0
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by______________________?
A. Bazin
B. Crimp and Bruges
C. William-Hazen
D. Kutter
pH value of sludge during alkaline regression stage, is__________________?
A. More than 7
B. Less than 7
C. Less than 6
D. More than 6
In normal conditions, the period for sludge digestion, is_______________?
A. 10 days
B. 20 days
C. 30 days
D. 60 days
The gas which may cause explosion in sewers, is_________________?
A. Carbondioxide
B. Methane
C. Ammonia
D. Carbon monoxide
Disposal to sewage in large cities, is done in__________________?
A. Irrigation
B. Dilution
C. Oxidation
D. Purification
For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________?
A. Potassium permanganate
B. Sulphuric acid and napthamine
C. Phenol-di -sulphuric acid potassium hydroxide
D. None of these
The pH value of fresh sewage is usually ______________________?
A. Equal to 7
B. More than 7
C. Less than 7
D. Equal to zero
The design period of sewage treatment works in normally_________________?
A. 5 – 10 years
B. 15 – 20 years
C. 30 – 40 years
D. 40 – 50 years
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