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.Management Sciences
Category: Waste Water Engineering
Which one of the following gases is most significant as air pollutant ?
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A. Carbondioxide
B. Oxygen
C. Nitrogen
D. Sulphur-dioxide
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is___________________?
A. D
B. 1.25 D
C. 1.5 D
D. 1.75 D
The ratio of minimum hourly flow to the average flow of sewage is_________________?
A. 1/4
B. 1/3
C. 1/2
D. 3/4
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called ____________________?
A. Inverted syphon
B. Depressed sewer
C. Sag pipe
D. all of these
Pick up the correct statement from the following ?
A. Turbidity is more in strong sewage
B. The black colour indicates septic sewage
C. The sewage omits offensive odours after four hours
D. All the above
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is____________________?
A. [(100 + P1)/(100 – P2)] V1
B. [(100 – P1)/(100 + P2)] V1
C. [(100 – P1)/(100 – P2)] V1
D. [(100 + P2)/(100 – P1)] V1
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