What is the primary source of wastewater ?
A. plastic waste
B. untreated sewage
C. agricultural runoff
D. All of them
Waste water Engineering
What is the main source of wastewater ?
A. residential and domestic sources
B. Mining
C. Radioactive waste
D. None of them
_____ poisoning water in Japan is from fishes.
A. Antimony
B. Palladium
C. Arsenic
D. Bismuth
Water content of sewage is about ____.
A. 9.9 %
B. 99 %
C. 90 %
D. 95 %
The detention period for plain sedimentation water tanks, is usually :
A. 24 to 36 hours
B. 4 to 8 hours
C. 8 to 16 hours
D. 16 to 24 hours
Skimming tanks are ____ :
A. Tanks provided with self-cleansing screens
B. Improved version of grit chambers
C. Used to remove the grease and oil
D. Those from which sludge is skimmed out
The factor responsible for purification of sewage in river is _____ ?
A. Temperature
B. Hydrology
C. Dissolved oxygen in water
D. All the above
Hume steel pipes are ____ ?
A. Steel shell coated from outside with cement mortar
B. Steel pipes
C. Steel shell coated from inside with cement mortar
D. Both a and c
Pick up the correct statement from the following
A. The larger the sewer in size, deposition will take place
B. The larger the sewer in size, no deposition will take place
C. The larger the sewer in size, more will be
D. The smaller the sewer in size, less will be velocity
Hydraulic mean radius is ____ ?
A. Mean of radii in a pipe line of varying cross-sections
B. Cross-sectional area/wetted perimeter
C. Mean radius of sewer
D. Difference in heads between two points in circular pipes