Waste Water Engineering
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

0.50 m/sec
0.60 m/sec
0.70 m/sec
0.75 m/sec

ANSWER DOWNLOAD EXAMIANS APP

Waste Water Engineering
In the activated sludge process

Water is removed by centrifugal action
Sludge is activated by constant stirring
Aeration is done with an admixture of previously aerated sludge
Aeration is continued till stability

ANSWER DOWNLOAD EXAMIANS APP