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.Management Sciences
Category: Waste Water Engineering
The pH value of sewage is determined with the help of_________________?
A. Imhoff Cone
B. Turbid meter
C. Potentiometer
D. None of these
Drop manholes are the manholes___________________?
A. Without entry ladders
B. Without manhole covers
C. With depths more than 3.5 m
D. Having drains at different levels
The minimum diameter of sewer to be adopted is_________________?
A. 10 cm
B. 12.5 cm
C. 15 cm
D. 25 cm
Skimming tanks are__________________?
A. Used to remove the grease and oil
B. Those from which sludge is skimmed out
C. Tanks provided with self- cleansing screens
D. Improved version of grit chambers
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at___________________?
A. Full depth
B. Half full
C. Two third full
D. Three fourth full
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 most efficient cross-section of sewers in a combined sewerage system is________________?
A. Parabolic
B. Circular
C. Rectangular
D. New egged
The coagulant which is generally not used for treating the sewage, is__________________?
A. Alum
B. Ferric chloride
C. Ferric sulphate
D. Chlorinated copperas
The stone ware sewers_________________?
A. Are used for carrying sewage and drainage from houses
B. Are manufactured from clays and shale
C. After casting are dried and burnt at temperature 150°C, 700°C and 1200°C
D. All the above
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is________________________?
A. 20 cm
B. 25 cm
C. 40 cm
D. 50 cm
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