Which one of the following gases is most significant as air pollutant ?
A. Carbondioxide
B. Oxygen
C. Nitrogen
D. Sulphur-dioxide
Waste Water Engineering
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is_____________________?
A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is_____________________?
A. 2.30 m
B. 2.40 m
C. 2.45 m
D. 2.50 m
Depletion of ozone layer in the outer atmosphere may cause___________________ ?
Depletion of ozone layer in the outer atmosphere may cause___________________ ?
A. Lung cancer
B. Skin cancer
C. Bronchitis
D. Heart disorder
The quantity of liquid waste which flows in sewers during the period of rainfall, is known__________________?
The quantity of liquid waste which flows in sewers during the period of rainfall, is known__________________?
A. Sanitary sewage
B. Industrial waste
C. Storm sewage
D. None of these
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is____________________?
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is____________________?
A. 100
B. 1000
C. 5000
D. 10000
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be__________________?
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be__________________?
A. 0.9 cm
B. 1.2 m
C. 1.5 m
D. > 1.5 m
Lead caulked joints are used for laying____________________?
Lead caulked joints are used for laying____________________?
A. Stone ware pipes
B. Earthenware pipes
C. C.I. pipes
D. G.I. pipes
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is_____________________?
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is_____________________?
A. 50 ppm
B. 100 ppm
C. 150 ppm
D. 200 ppm
The pH value of fresh sewage is usually ______________________?
The pH value of fresh sewage is usually ______________________?
A. Equal to 7
B. More than 7
C. Less than 7
D. Equal to zero
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is ____________________?
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is ____________________?
A. 20 mm
B. 30 mm
C. 40 mm
D. 50 mm