A. Raising low lying areas by dumping
B. Concreting
C. Both A. and B.
D. Neither A. nor B
0
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?
0
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?
A. 1 in 60
B. 1 in 100
C. 1 in 120
D. None of these
0
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?
A. Imhoff tanks
B. Trickling filters
C. Sludge sedimentation tanks
D. None of these
0
If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
0
If q is the average sewage flow from a city of population P, the maximum sewage flow______________?
A. /2
B. /4
C. /3
D. D
0
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?
A. Q = [(4 + )/(18 + )] q
B. Q = [(18 + P)/(4 + )] q
C. Q = [(18 + )/(4 + )] q
D. Q = [(5 + )/((15 + )] q
0
The sewer that unloads the sewage at the point of treatment is called_________________?
A. 16 m
B. 20 m
C. 24 m
D. 30 m
0
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for__________________?
A. Main sewer
B. Outfall sewer
C. Branch sewer
D. House sewer
0
At the junction of sewers___________________?
A. Unexpected large scale infiltration of stream water
B. Unexpected increase in the population
C. Under estimates of maximum and average flows
D. All of the above
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