The rate of accumulation of sludge per person per year, is_______________________?
(A) 10 litres
(B) 15 litres
(C) 20 litres
(D) 25 litres
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?
(A) Is only provided
(B) Is doubled
(C) Is trebled
(D) Is not enough
The flow velocity in detritus tanks is________________?
(A) 0.05 m/sec
(B) 0.09 m/sec
(C) 1.25 m/sec
(D) None of these
The water carried sewerage system removes__________________?
(A) Domestic sewage
(B) Industrial sewage
(C) Storm sewage
(D) All the above
Pick up the incorrect size of stone ware sewers_________________?
(A) 52.5 cm
(B) 67.5 cm
(C) 82.5 cm
(D) None of these
Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________?
(A) Both A and R is true and R is the correct explanation of A
(B) Both A and R is true but R is not a correct explanation of A
(C) A is true but R is false
(D) A is false but R is true
The clarigesters are_________________?
(A) Circular septic tanks
(B) Rectangular septic tanks
(C) Circular Imhoff double tanks with bottom hoppers
(D) Circular Imhoff double storey tanks without bottom hoppers
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________?
(A) D’ = 0.64 D
(B) D’ = 0.74 D
(C) D’ = 0.84 D
(D) D’ = 0.94 D
In case of Imhoff tanks_____________________?
(A) The shape is rectangular
(B) Detention period is 2 hours
(C) The velocity of flow is restricted to 0.30 m/minute
(D) All the above
The maximum depth of sedimentation tanks, is kept__________________?
(A) 3 m
(B) 3.5 m
(C) 4 m
(D) 4.5 m