The gradient of sewers depends upon_________________?
A. Velocity of flow
B. Diameter of the sewer
C. Discharge
D. All the above
Waste Water Engineering
The standard B.O.D. of water is taken for_________________?
The standard B.O.D. of water is taken for_________________?
A. 1 day
B. 2 days
C. 3 days
D. 5 days
Fresh sewage may become stale in_________________?
Fresh sewage may become stale in_________________?
A. One hour
B. Two to three hours
C. Three to four hours
D. Six hours
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?
A. 100 cm
B. 110 cm
C. 120 cm
D. 150 cm
Drop manholes at the junctions of sewer lines, are provided if________________?
Drop manholes at the junctions of sewer lines, are provided if________________?
A. Invert level of a branch sewer is more than 60 cm that of the main sewer
B. Sewer line runs along a main road
C. Ordinary manhole cannot be built
D. Two sewer lines intersect
During purification process of sewage the gas given off, is________________?
During purification process of sewage the gas given off, is________________?
A. Carbon dioxide
B. Hydrogen
C. Ammonia
D. All the above
The sewerage system originates from__________________?
The sewerage system originates from__________________?
A. House sewers
B. Lateral sewers
C. Branch sewers
D. Main sewers
In septic tanks, decomposition of organic bacteria, is done by_____________________?
In septic tanks, decomposition of organic bacteria, is done by_____________________?
A. Anaerobic bacteria
B. Aerobic bacteria
C. Both types of bacterias
D. None of these
Sewer pipes need be checked for_________________?
Sewer pipes need be checked for_________________?
A. Minimum flow
B. Maximum flow
C. Both A. and B.
D. None of these
hydraulically equivalent, the relationship which holds good, is _______________?
hydraulically equivalent, the relationship which holds good, is _______________?
A. D8/3 = 4 b8/3
B. D3/8 = 4 b3/8
C. D2/3 = 4 b2/3
D. D3/2 = 4 b3/2