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.Management Sciences
Category: Waste Water Engineering
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed________________?
0
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
R.M.O. expenses include___________________?
A. Running expenses
B. Maintenance expenses
C. Operation expenses
D. All the above
Rate of flow of sewage is generally assumed__________________?
A. More than the rate of water supply
B. Equal to the rate of water supply
C. Less than the rate of water supply
D. At 150 litres per capita
The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known_____________________?
A. House sewer
B. Lateral sewer
C. Branch sewer
D. Sewer outfall
In 1000 kg of sewage, the total solids approximate___________________?
A. 0.5 to 1.0 kg
B. 1 kg to 2.0 kg
C. 5 kg to 7.5 kg
D. 7.5 kg to 10 kg
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