Category: Waste Water Engineering

A. House sewers
B. Lateral sewers
C. Branch sewers
D. Main sewers

A. Flourish in the presence of free oxygen
B. Consume organic matter as their food
C. Oxidise organic matter in sewage
D. All the above

A. 10 cm
B. 12 cm
C. 15 cm
D. 18 cm

A. Mean radius of sewer
B. Difference in heads between two points in circular pipes
C. Mean of radii in a pipe line of varying cross -sections
D. Cross-sectional area/wetted perimeter

A. The sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge
B. The sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge
C. The minimum design velocity of sewer pipes is taken as 0.8 m/sec
D. All the above

A. 1.5
B. 2.0
C. 3.0
D. 4.0

A. Water test
B. Smoke test
C. Straightness test
D. All the above

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

A. Small sewers are cleaned by flushing
B. Medium sewers are cleaned by cane rodding
C. Medium sewers may be cleaned by pills
D. All the above

A. Screening
B. Skimming
C. Filtration
D. None of these