WASTE WATER ENGINEERING QUIZ

4.5 to 5.5 m/sec

3.0 to 4.0 m/sec

2.5 to 3.0 m/sec

3.5 to 4.5 m/sec

Sedimentation tanks with high rate trickling filters

A plant consisting of Imhoff tanks with low rate trickling filters

None of these

A sedimentation tank and an activated sludge treatment plant

Both B and C

Steel pipes

Steel shell coated from outside with cement mortar

Steel shell coated from inside with cement mortar

Depth of 0.9 m to 1.20 m is kept

Flow velocity 0.15 m to 0.3 m/sec is kept

All of these

One minute of detention period is kept

75 m

20 m

45 m

30 m

0.9

0.999

0.99

0.95

0.75 m/sec

0.70 m/sec

0.50 m/sec

0.60 m/sec

Between 200 to 300

Less than 150

Between 150 to 200

More than 500

1 in 60

1 in 120

None of these

1 in 100

Mean radius of sewer

Mean of radii in a pipe line of varying cross -sections

Difference in heads between two points in circular pipes

Cross-sectional area/wetted perimeter