Top 250+ Solved Water and Wastewater Engineering MCQ Questions Answer
Q. For sewers, inverted siphon is provided for
a. One pipe
b. Two pipes
c. Three pipes
d. Four pipes
Q. In sewers designed with self cleansing velocity,
a. The bottom is silted
b. The bottom is scoured
c. Both silting and scouring occur at the bottom
d. Neither silting nor scouring occurs at the bottom
Q. Pathogens (or pathogenic bacteria’s) in water may cause
a. Typhoid
b. Cholera
c. Dysentery
d. All the above
Q. The rate of accumulation of sludge per person per year, is
a. 10 litres (B) (C) (D)
b. 15 litres
c. 20 litres
d. 25 litres
Q. 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
Q. 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
Q. In detritus tanks
a. Flow velocity is kept 0.09 m/
b. Detention period is kept 3 to 4 minutes
c. Organic and inorganic materials are separated
d. All the above
Q. 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
Q. If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circularsection, is
a. 1045 mm
b. 1065 mm
c. 1075 mm
d. 1095 mm
Q. A nuisance is experienced in diluting water if dilution factor is less than
a. 100
b. 60
c. 40
d. 20
Q. A manhole is generally provided at each
a. Bend
b. Junction
c. Change of gradient
d. All the above
Q. The asbestos cement pipes are generally laid
a. Horizontally
b. Vertically
c. At an angle of 30°
d. At an angle of 60°
Q. Design period of 40 to 50 years is adopted for
a. Branch sewers
b. Main sewers
c. Trunk sewers
d. All the above