Waste Water Engineering Mcqs

1.

Pick up the correct statement from the following?

A. The circular section of sewers provides maximum hydraulic mean depth

B. The circular sewers are provided for separate sewerage system

C. The circular sewers work efficiently if the sections run at least half full

D. All the above

A. Anaerobic bacteria flourish in the absence of oxygen

B. Aerobic bacteria flourish in the presence of oxygen

C. Facultative bacteria flourish with or without oxygen

D. All the above

A. The mixture of water and waste products, is called sewage

B. The treated sewage effluents, are generally used for irrigating the crops

C. The process of collecting, treating and disposing off the sewage, is called sewerage

D. The old convergence system was definitely better than water carried sewerage system

A. The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion

B. Sludge digestion is carried out in sludge tank

C. The gases produced in sludge digestion process, contain 75% carbon dioxide

D. The gases produced in sludge digestion process, contain 75% methane