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.Management Sciences
Category: Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________?
0
A. D’ = 0.64 D
B. D’ = 0.74 D
C. D’ = 0.84 D
D. D’ = 0.94 D
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is___________________?
A. 1 in 60
B. 1 in 100
C. 1 in 120
D. None of these
As compared to fresh river water, sea water contains oxygen_________________?
A. 10% less
B. 20% less
C. 10% more
D. 20% more
Lead acetate test in sewer manhole is done to test the presence of ____________________?
A. Methane gas
B. Hydrogen sulphide
C. Carbondioxide gas
D. Diesel vapours
For house drainage minimum gradient is__________________?
A. 1 in 60
B. 1 in 80
C. 1 in 10
D. 1 in 400
Antisyphonage pipe is fitted_______________?
A. At the end of septic tanks
B. On manholes
C. With a W.C. trap
D. At the beginning of sewer line
Aerobic activity is maximum_______________?
A. In freshly produced sewage
B. At sewer pipes
C. In sewer treatment plants
D. None of these
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided________________?
A. 15 cm c/c
B. 22.5 cm c/c
C. 30 cm c/c
D. 50 cm c/c
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