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.Management Sciences
Category: Waste Water Engineering
Pick up the correct statement from the following?
A. In treated sewage, 4 ppm of D.O. is essential
B. Only very fresh sewage contains some dissolved oxygen
C. The solubility of oxygen in sewage is 95% that is in distilled water
D. All the above
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________?
A. 200 ppm
B. 225 ppm
C. 250 ppm
D. None of these
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
The sewer pipe which carries sewage from a building for immediate disposal is______________?
A. House sewer
B. Lateral sewer
C. Intercepting sewer
D. Main sewer
Pick up the correct statement from the following?
A. The boning rod is used for checking the levels of the sewer inverts
B. Manhole covers are made circular for the convenience of the cleaning staff
C. A manhole is classified as shallow manhole if its depth is less than 0.9 m
D. All the above
The factor responsible for purification of sewage in river is________________?
A. Hydrology
B. Dissolved oxygen in water
C. Temperature
D. All the above
For treating the sewage of a large city, you will recommend_________________?
A. A sedimentation tank and an activated sludge treatment plant
B. A plant consisting of Imhoff tanks with low rate trickling filters
C. Sedimentation tanks with high rate trickling filters
D. None of these
It is customary to design a sewer for D.W.F. on the basis of________________?
A. Average demand
B. Twice the average demand
C. Thrice the average demand
D. Four times the average demand
The rate of accumulation of sludge in septic tanks is recommended as____________________?
A. 30 litres/person/year
B. 25 litres/person/year
C. 30 litres/person/month
D. 25 litres/person/month
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