The rational formula for peak drainage discharge, was evolved by_________________?
A. Fruhling
B. Lloyd David
C. Kuichling
D. All of these
Waste Water Engineering
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__________________?
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
Assertion A.: The determination of pH value of sewerage is important. Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value________________?
Assertion A.: The determination of pH value of sewerage is important. Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value________________?
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
For the open drain (N = 0.025) shown in the below figure, the discharge is________________?
For the open drain (N = 0.025) shown in the below figure, the discharge is________________?
A. 26.88 cumecs
B. 27.88 cumecs
C. 28.88 cumecs
D. 29.88 cumecs
The Chezy’s constant C in the formula V = C_________________?
The Chezy’s constant C in the formula V = C_________________?
A. Size of the sewer
B. Shape of the sewer
C. Roughness of sewer surface
D. All the above
If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains_______________?
If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains_______________?
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
The coagulant which is generally not used for treating the sewage, is__________________?
The coagulant which is generally not used for treating the sewage, is__________________?
A. Alum
B. Ferric chloride
C. Ferric sulphate
D. Chlorinated copperas
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is ?
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is ?
A. Centrifugal pump
B. Pneumatic ejector
C. Reciprocating pump
D. None of these
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of______________?
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of______________?
A. 15 days
B. 30 days
C. 60 days
D. 90 days
No treatment of the sewage is given if dilution factor is_____________?
No treatment of the sewage is given if dilution factor is_____________?
A. Less than 150
B. Between 150 to 200
C. Between 200 to 300
D. More than 500