RVUNL_CE_Quiz 65_Revision Quiz

The MLSS concentration in the aeration tank of extended aeration activated sludge process is 5000 mg/l. If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of 200 mg/l, then the sludge volume index would be nearly:

If for diluting 25 ml of water sample in 200 ml of taste free water is required to be added to make the water sample to just loose its taste, then the flavor threshold number (FTN) will be

What is the maximum permissible limit of fluoride in drinking water?

Pick up the incorrect option regarding discharges through sewer.

If settling velocity is 1 cm/sec then corresponding surface loading in litre per day per m² will be

The leachate forms from which of the following treatment process?

What is the cause of bulking of sewage?

A grit chamber of dimension 15 m x 2 m x 0.8 m liquid depth flow of 800 m³/hr. Its detention time is

Which of the following process includes chlorination of water above the break point?