Category: Waste Water Engineering

A. Boiling
B. Adding potassium permanganate
C. Adding sulphuric acid
D. Phenol-di-sulphuric acid

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

A. 2 to 3 mm
B. 3 to 5 mm
C. 5 to 8 mm
D. 8 to 10 mm

A. 100 cm
B. 110 cm
C. 120 cm
D. 150 cm

A. Stone ware pipes
B. Earthenware pipes
C. C.I. pipes
D. G.I. pipes

A. 2 days
B. 7 days
C. 12 days
D. 14 days

A. Chezy
B. Manning
C. Bazin
D. Kutter

A. Velocity of flow
B. Diameter of the sewer
C. Discharge
D. All the above

A. Light in weight
B. Not structurally strong to bear large compressive stress
C. Susceptible to corrosion by sulphuric acid
D. All the above

A. When sewage is fresh
B. When diluting water has high dissolved oxygen content
C. When diluting water is used for water supply near the point of sewage disposed
D. When the diluting water is having flow currents