The design period in years for pumping plants, is___________________?
(A) 1
(B) 2 to 3
(C) 3 to 5
(D) 5 to 10
A manhole is generally provided at each__________________?
(A) Bend
(B) Junction
(C) Change of gradient
(D) All the above
A nuisance is experienced in diluting water if dilution factor is less than_________________?
(A) 100
(B) 60
(C) 40
(D) 20
If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is___________________?
(A) 1045 mm
(B) 1065 mm
(C) 1075 mm
(D) 1095 mm
In detritus tanks______________________?
(A) Flow velocity is kept 0.09 m/sec
(B) Detention period is kept 3 to 4 minutes
(C) Organic and inorganic materials are separated
(D) All the above
The screens are fixed___________________?
(A) Perpendicular to the direction of flow
(B) Parallel to the direction of flow
(C) At an angle 30° to 60° to the direction of flow
(D) None of these
Pathogens (or pathogenic bacterias) in water may cause___________________?
(A) Typhoid
(B) Cholera
(C) Dysentery
(D) All the above
The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in__________________?
(A) Chezy’s formula
(B) Bazin’s formula
(C) Kutter’s formula
(D) Manning’s formula
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________?
(A) pt = 3H3p/2 Z5
(B) pt = 2H3p/3 Z5
(C) pt = 3H3p/2Z5
(D) pt = 2 3p/3Z5
Ventilating shafts are provided to a sewer line at every__________________?
(A) 100 m
(B) 150 m
(C) 200 m
(D) 300 m