The sludge does not contain waste water from_________________?
(A) Bath rooms
(B) Wash basins
(C) Kitchen sinks
(D) Toilets
R.M.O. expenses include___________________?
(A) Running expenses
(B) Maintenance expenses
(C) Operation expenses
(D) All the above
1000 kg of sewage contains________________?
(A) 0.112 kg in suspension
(B) 0.112 kg in solution
(C) 0.225 kg in solution
(D) Both
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
The sewer which received discharge from two or more main sewers, is known as_______________?
(A) A trunk sewer
(B) An outfall sewer
(C) A main sewer
(D) An intercepting sewer
Hydraulic mean radius is_______________?
(A) Mean radius of sewer
(B) Difference in heads between two points in circular pipes
(C) Mean of radii in a pipe line of varying cross -sections
(D) Cross-sectional area/wetted perimeter
Traps_________________?
(A) Are water seals which prevent the entry of foul gases
(B) Are used to trap the rats entering sewers
(C) Dissolve the foul gases
(D) Create symphonic action to increase the quick disposal of sewerage
Aerobic bacterias___________________?
(A) Flourish in the presence of free oxygen
(B) Consume organic matter as their food
(C) Oxidise organic matter in sewage
(D) All the above
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
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?
(A) 2 hours
(B) 4 hours
(C) 6 hours
(D) 8 hours