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.Management Sciences
Category: Waste Water Engineering
The use of coarse screens for the disposal of sewage, may be dispensed with by______________?
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A. Comminutor
B. Shredder
C. Both A. and B.
D. Neither A. nor B.
Sewer ventilating columns are generally placed at_______________?
A. Distances 150 m to 300 m
B. Upper ends of branch sewers
C. Every change in the size of sewers
D. All the above
The recommended detention period for grit chambers is_______________?
A. 1 minute
B. 2 minutes
C. 3 minutes
D. 5 minutes
In sewage, the solids in mg per litre is__________________?
A. 100 to 500
B. 500 to 1000
C. 1000 to 1500
D. 1500 to 2000
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________?
A. pt = 3H3p/2 Z5
B. pt = 2H3p/3 Z5
C. pt = 3H3p/2Z5
D. pt = 2 3p/3Z5
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed________________?
A. 3 ppm
B. 4 ppm
C. 5 ppm
D. 10 ppm
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is__________________?
A. 0.10 cumec
B. 0.12 cumec
C. 0.15 cumec
D. 0.20 cumec
The screens are fixed___________________?
A. Perpendicular to the direction of flow
B. Parallel to the direction of flow
C. At an angle 30° to 60° to the direction of flow
D. None of these
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is_________________?
A. 2.25
B. 2.50
C. 2.55
D. 2.65
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