The sewer that unloads the sewage at the point of treatment is called_________________?
(A) Main sewer
(B) Outfall sewer
(C) Branch sewer
(D) House sewer
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) 16 m
(B) 20 m
(C) 24 m
(D) 30 m
If q is the average sewage flow from a city of population P, the maximum sewage flow______________?
(A) Q = [(4 + )/(18 + )] q
(B) Q = [(18 + P)/(4 + )] q
(C) Q = [(18 + )/(4 + )] q
(D) Q = [(5 + )/((15 + )] q
If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?
(A) /2
(B) /4
(C) /3
(D) D
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?
(A) Hydrogen sulphide
(B) Carbon dioxide
(C) Methane
(D) Oxygen
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?
(A) Imhoff tanks
(B) Trickling filters
(C) Sludge sedimentation tanks
(D) None of these
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?
(A) 1 in 60
(B) 1 in 100
(C) 1 in 120
(D) None of these
Imhoff cone is used to measure________________?
(A) Total organic solids
(B) Total solids
(C) Total in organic solids
(D) Settleable solids
Pick up the correct statement from the following ?
(A) Turbidity is more in strong sewage
(B) The black colour indicates septic sewage
(C) The sewage omits offensive odours after four hours
(D) All the above
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________?
(A) A heap
(B) Plateau
(C) Windrow
(D) None of these